if (is_string($value)) {
         $matches = [];
         $count = preg_match_all('/(]*>)(.*?)(<\/pre>)/is', $value, $matches);
         for ($i = 0; $i < $count; ++$i) {
            $complete       = $matches[0][$i];
            $cleaned        = self::clean_cross_side_scripting_deep($matches[2][$i]);
            $cleancomplete  = $matches[1][$i].$cleaned.$matches[3][$i];
            $value          = str_replace($complete, $cleancomplete, $value);
         }

         $config                      = ['safe'=>1];
         $config["elements"]          = "*+iframe+audio+video";
         $config["direct_list_nest"]  = 1;

         $value                       = htmLawed($value, $config);

         // Special case : remove the 'denied:' for base64 img in case the base64 have characters
         // combinaison introduce false positive
         foreach (['png', 'gif', 'jpg', 'jpeg'] as $imgtype) {
            $value = str_replace('src="denied:data:image/'.$imgtype.';base64,',
                  'src="data:image/'.$imgtype.';base64,', $value);
         }
      }

      return $value;
   }

   /**
    * Log in 'php-errors' all args
    *
    * @param Logger  $logger Logger instance, if any
    * @param integer $level  Log level (defaults to warning)
    * @param array   $args   Arguments (message to log, ...)
    *
    * @return void
   **/
   private static function log($logger = null, $level = Logger::WARNING, $args = null) {
      static $tps = 0;

      $extra = [];
      if (method_exists('Session', 'getLoginUserID')) {
         $extra['user'] = Session::getLoginUserID().'@'.php_uname('n');
      }
      if ($tps && function_exists('memory_get_usage')) {
         $extra['mem_usage'] = number_format(microtime(true)-$tps, 3).'", '.
                      number_format(memory_get_usage()/1024/1024, 2).'Mio)';
      }

      $msg = "";
      if (function_exists('debug_backtrace')) {
         $bt  = debug_backtrace();
         if (count($bt) > 2) {
            if (isset($bt[2]['class'])) {
               $msg .= $bt[2]['class'].'::';
            }
            $msg .= $bt[2]['function'].'() in ';
         }
         $msg .= $bt[1]['file'] . ' line ' . $bt[1]['line'] . "\n";
      }

      if ($args == null) {
         $args = func_get_args();
      } else if (!is_array($args)) {
         $args = [$args];
      }

      foreach ($args as $arg) {
         if (is_array($arg) || is_object($arg)) {
            $msg .= str_replace("\n", "\n  ", print_r($arg, true));
         } else if (is_null($arg)) {
            $msg .= 'NULL ';
         } else if (is_bool($arg)) {
            $msg .= ($arg ? 'true' : 'false').' ';
         } else {
            $msg .= $arg . ' ';
         }
      }

      if (defined('TU_USER') && $level >= Logger::NOTICE) {
         throw new \RuntimeException($msg);
      }

      $tps = microtime(true);

      if ($logger === null) {
         global $PHPLOGGER;
         $logger = $PHPLOGGER;
      }

      try {
         $logger->addRecord($level, $msg, $extra);
      } catch (\Exception $e) {
         //something went wrong, make sure logging does not cause fatal
         error_log($e);
      }

      if (isCommandLine() && $level >= Logger::WARNING) {
         echo $msg;
      }
   }

   /**
    * PHP debug log
    */
   static function logDebug() {
      self::log(null, Logger::DEBUG, func_get_args());
   }

   /**
    * PHP info log
    */
   static function logInfo() {
      self::log(null, Logger::INFO, func_get_args());
   }

   /**
    * PHP warning log
    */
   static function logWarning() {
      self::log(null, Logger::WARNING, func_get_args());
   }

   /**
    * PHP error log
    */
   static function logError() {
      self::log(null, Logger::ERROR, func_get_args());
   }

   /**
    * SQL error log
    */
   static function logSqlDebug() {
      global $SQLLOGGER;
      $args = func_get_args();
      self::log($SQLLOGGER, Logger::DEBUG, $args);
   }

   /**
    * SQL error log
    */
   static function logSqlError() {
      global $SQLLOGGER;
      $args = func_get_args();
      $msg = $args[0];
      try {
         self::log($SQLLOGGER, Logger::ERROR, $args);
      } catch (\RuntimeException $e) {
         $msg = $e->getMessage();
      } finally {
         if (class_exists('GlpitestSQLError')) { // For unit test
            throw new \GlpitestSQLError($msg);
         }
      }
   }


   /**
    * Generate a Backtrace
    *
    * @param string $log  Log file name (default php-errors) if false, return the string
    * @param string $hide Call to hide (but display script/line)
    * @param array  $skip Calls to not display at all
    *
    * @return string if $log is false
    *
    * @since 0.85
   **/
   static function backtrace($log = 'php-errors', $hide = '', array $skip = []) {

      if (function_exists("debug_backtrace")) {
         $message = "  Backtrace :\n";
         $traces  = debug_backtrace();
         foreach ($traces as $trace) {
            $script = (isset($trace["file"]) ? $trace["file"] : "") . ":" .
                        (isset($trace["line"]) ? $trace["line"] : "");
            if (strpos($script, GLPI_ROOT)===0) {
               $script = substr($script, strlen(GLPI_ROOT)+1);
            }
            if (strlen($script)>50) {
               $script = "...".substr($script, -47);
            } else {
               $script = str_pad($script, 50);
            }
            $call = (isset($trace["class"]) ? $trace["class"] : "") .
                    (isset($trace["type"]) ? $trace["type"] : "") .
                    (isset($trace["function"]) ? $trace["function"]."()" : "");
            if ($call == $hide) {
               $call = '';
            }

            if (!in_array($call, $skip)) {
               $message .= "  $script $call\n";
            }
         }
      } else {
         $message = "  Script : " . $_SERVER["SCRIPT_FILENAME"]. "\n";
      }

      if ($log) {
         self::logInFile($log, $message, true);
      } else {
         return $message;
      }
   }

   /**
    * Send a deprecated message in log (with backtrace)
    * @param  string $message the message to send
    * @return void
    */
   static function deprecated($message = "Called method is deprecated") {
      trigger_error($message, E_USER_DEPRECATED);
   }


   /**
    * Log a message in log file
    *
    * @param string  $name   name of the log file
    * @param string  $text   text to log
    * @param boolean $force  force log in file not seeing use_log_in_files config
    *
    * @return boolean
   **/
   static function logInFile($name, $text, $force = false) {
      global $CFG_GLPI;

      $user = '';
      if (method_exists('Session', 'getLoginUserID')) {
         $user = " [".Session::getLoginUserID().'@'.php_uname('n')."]";
      }

      $ok = true;
      if ((isset($CFG_GLPI["use_log_in_files"]) && $CFG_GLPI["use_log_in_files"])
          || $force) {
         $ok = error_log(date("Y-m-d H:i:s")."$user\n".$text, 3, GLPI_LOG_DIR."/".$name.".log");
      }

      if (isset($_SESSION['glpi_use_mode'])
          && ($_SESSION['glpi_use_mode'] == Session::DEBUG_MODE)
          && isCommandLine()) {
         $stderr = fopen('php://stderr', 'w');
         fwrite($stderr, $text);
         fclose($stderr);
      }
      return $ok;
   }


   /**
    * Specific error handler in Normal mode
    *
    * @param integer $errno     level of the error raised.
    * @param string  $errmsg    error message.
    * @param string  $filename  filename that the error was raised in.
    * @param integer $linenum   line number the error was raised at.
    *
    * @return string  Error type
    *
    * @deprecated 9.5.0
   **/
   static function userErrorHandlerNormal($errno, $errmsg, $filename, $linenum) {

      Toolbox::deprecated();

      $errortype = [E_ERROR             => 'Error',
                         E_WARNING           => 'Warning',
                         E_PARSE             => 'Parsing Error',
                         E_NOTICE            => 'Notice',
                         E_CORE_ERROR        => 'Core Error',
                         E_CORE_WARNING      => 'Core Warning',
                         E_COMPILE_ERROR     => 'Compile Error',
                         E_COMPILE_WARNING   => 'Compile Warning',
                         E_USER_ERROR        => 'User Error',
                         E_USER_WARNING      => 'User Warning',
                         E_USER_NOTICE       => 'User Notice',
                         E_STRICT            => 'Runtime Notice',
                         E_RECOVERABLE_ERROR => 'Catchable Fatal Error',
                         E_DEPRECATED        => 'Deprecated function',
                         E_USER_DEPRECATED   => 'User deprecated function'];

      $err = '  *** PHP '.$errortype[$errno] . "($errno): $errmsg\n";

      $skip = ['Toolbox::backtrace()'];
      if (isset($_SESSION['glpi_use_mode']) && $_SESSION['glpi_use_mode'] == Session::DEBUG_MODE) {
         $hide   = "Toolbox::userErrorHandlerDebug()";
         $skip[] = "Toolbox::userErrorHandlerNormal()";
      } else {
         $hide = "Toolbox::userErrorHandlerNormal()";
      }

      $err .= self::backtrace(false, $hide, $skip);

      // For unit test
      if (class_exists('GlpitestPHPerror')) {
         if (in_array($errno, [E_ERROR, E_USER_ERROR])) {
            throw new GlpitestPHPerror($err);
         }
         /* for tuture usage
         if (in_array($errno, [E_STRICT, E_WARNING, E_CORE_WARNING, E_USER_WARNING, E_DEPRECATED, E_USER_DEPRECATED])) {
             throw new GlpitestPHPwarning($err);
         }
         if (in_array($errno, [E_NOTICE, E_USER_NOTICE])) {
            throw new GlpitestPHPnotice($err);
         }
         */
      }

      // Save error
      static::logError($err);

      return $errortype[$errno];
   }


   /**
    * Specific error handler in Debug mode
    *
    * @param integer $errno     level of the error raised.
    * @param string  $errmsg    error message.
    * @param string  $filename  filename that the error was raised in.
    * @param integer $linenum   line number the error was raised at.
    *
    * @return void
    *
    * @deprecated 9.5.0
   **/
   static function userErrorHandlerDebug($errno, $errmsg, $filename, $linenum) {

      Toolbox::deprecated();

      // For file record
      $type = self::userErrorHandlerNormal($errno, $errmsg, $filename, $linenum);

      if (0 === error_reporting()) {
         // Do not display error message if '@' operator is used on errored expression
         // see https://www.php.net/manual/en/language.operators.errorcontrol.php
         return;
      }

      // Display
      if (!isCommandLine()) {
         echo '
'.
              'PHP '.$type.': ';
         echo $errmsg.' in '.$filename.' at line '.$linenum.'
';
      } else {
         echo 'PHP '.$type.': '.$errmsg.' in '.$filename.' at line '.$linenum."\n";
      }
   }


   /**
    * Switch error mode for GLPI
    *
    * @param integer|null $mode       From Session::*_MODE
    * @param boolean|null $debug_sql
    * @param boolean|null $debug_vars
    * @param boolean|null $log_in_files
    *
    * @return void
    *
    * @since 0.84
   **/
   static function setDebugMode($mode = null, $debug_sql = null, $debug_vars = null, $log_in_files = null) {
      global $CFG_GLPI;

      if (isset($mode)) {
         $_SESSION['glpi_use_mode'] = $mode;
      }
      if (isset($debug_sql)) {
         $CFG_GLPI['debug_sql'] = $debug_sql;
      }
      if (isset($debug_vars)) {
         $CFG_GLPI['debug_vars'] = $debug_vars;
      }
      if (isset($log_in_files)) {
         $CFG_GLPI['use_log_in_files'] = $log_in_files;
      }

      // If debug mode activated : display some information
      if ($_SESSION['glpi_use_mode'] == Session::DEBUG_MODE) {
         // Force reporting of all errors
         error_reporting(E_ALL);
         // Disable native error displaying as it will be done by custom handler
         ini_set('display_errors', 'Off');
      }
   }


   /**
    * Send a file (not a document) to the navigator
    * See Document->send();
    *
    * @param string      $file        storage filename
    * @param string      $filename    file title
    * @param string|null $mime        file mime type
    * @param boolean     $add_expires add expires headers maximize cacheability ?
    *
    * @return void
   **/
   static function sendFile($file, $filename, $mime = null, $expires_headers = false) {

      // Test securite : document in DOC_DIR
      $tmpfile = str_replace(GLPI_DOC_DIR, "", $file);

      if (strstr($tmpfile, "../") || strstr($tmpfile, "..\\")) {
         Event::log($file, "sendFile", 1, "security",
                    $_SESSION["glpiname"]." try to get a non standard file.");
         echo "Security attack!!!";
         die(1);
      }

      if (!file_exists($file)) {
         echo "Error file $file does not exist";
         die(1);
      }

      // if $mime is defined, ignore mime type by extension
      if ($mime === null && preg_match('/\.(...)$/', $file)) {
         $finfo = finfo_open(FILEINFO_MIME_TYPE);
         $mime = finfo_file($finfo, $file);
         finfo_close($finfo);
      }

      // don't download picture files, see them inline
      $attachment = "";
      // if not begin 'image/'
      if (strncmp($mime, 'image/', 6) !== 0
          && $mime != 'application/pdf'
          // svg vector of attack, force attachment
          // see https://github.com/glpi-project/glpi/issues/3873
          || $mime == 'image/svg+xml') {
         $attachment = ' attachment;';
      }

      $etag = md5_file($file);
      $lastModified = filemtime($file);

      // Make sure there is nothing in the output buffer (In case stuff was added by core or misbehaving plugin).
      // If there is any extra data, the sent file will be corrupted.
      while (ob_get_level() > 0) {
         ob_end_clean();
      }
      // Now send the file with header() magic
      header("Last-Modified: ".gmdate("D, d M Y H:i:s", $lastModified)." GMT");
      header("Etag: $etag");
      header_remove('Pragma');
      header('Cache-Control: private');
      if ($expires_headers) {
         $max_age = WEEK_TIMESTAMP;
         header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', time() + $max_age));
      }
      header(
         "Content-disposition:$attachment filename=\"" .
         addslashes(utf8_decode($filename)) .
         "\"; filename*=utf-8''" .
         rawurlencode($filename)
      );
      header("Content-type: ".$mime);

      // HTTP_IF_NONE_MATCH takes precedence over HTTP_IF_MODIFIED_SINCE
      // http://tools.ietf.org/html/rfc7232#section-3.3
      if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && trim($_SERVER['HTTP_IF_NONE_MATCH']) === $etag) {
         http_response_code(304); //304 - Not Modified
         exit;
      }
      if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && @strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $lastModified) {
         http_response_code(304); //304 - Not Modified
         exit;
      }

      readfile($file) or die ("Error opening file $file");
   }


   /**
    *  Add slash for variable & array
    *
    * @param string|string[] $value value to add slashes
    *
    * @return string|string[]
   **/
   static function addslashes_deep($value) {
      global $DB;

      $value = ((array) $value === $value)
                  ? array_map([__CLASS__, 'addslashes_deep'], $value)
                  : (is_null($value)
                       ? null : (is_resource($value)
                       ? $value : $DB->escape(
                          str_replace(
                             [''', ''', ''', ''', '"'],
                             ["'", "'", "'", "'", "\""],
                             $value
                          )
                       ))
                    );

      return $value;
   }


   /**
    * Strip slash  for variable & array
    *
    * @param array|string $value  item to stripslashes
    *
    * @return array|string stripslashes item
   **/
   static function stripslashes_deep($value) {

      $value = ((array) $value === $value)
                  ? array_map([__CLASS__, 'stripslashes_deep'], $value)
                  : (is_null($value)
                        ? null : (is_resource($value)
                                    ? $value :stripslashes($value)));

      return $value;
   }

   /** Converts an array of parameters into a query string to be appended to a URL.
    *
    * @param array  $array      parameters to append to the query string.
    * @param string $separator  separator may be defined as & to display purpose
    * @param string $parent     This should be left blank (it is used internally by the function).
    *
    * @return string  Query string to append to a URL.
   **/
   static function append_params($array, $separator = '&', $parent = '') {

      $params = [];
      foreach ($array as $k => $v) {

         if (is_array($v)) {
            $params[] = self::append_params($v, $separator,
                                            (empty($parent) ? rawurlencode($k)
                                                            : $parent . '%5B' . rawurlencode($k) . '%5D'));
         } else {
            $params[] = (!empty($parent) ? $parent . '%5B' . rawurlencode($k) . '%5D' : rawurlencode($k)) . '=' . rawurlencode($v);
         }
      }
      return implode($separator, $params);
   }


   /**
    * Compute PHP memory_limit
    *
    * @param string $ininame  name of the ini ooption to retrieve (since 9.1)
    *
    * @return integer memory limit
   **/
   static function getMemoryLimit($ininame = 'memory_limit') {

      $mem = ini_get($ininame);
      $matches = [];
      preg_match("/([-0-9]+)([KMG]*)/", $mem, $matches);
      $mem = "";

      // no K M or G
      if (isset($matches[1])) {
         $mem = $matches[1];
         if (isset($matches[2])) {
            switch ($matches[2]) {
               case "G" :
                  $mem *= 1024;
                  // nobreak;

               case "M" :
                  $mem *= 1024;
                  // nobreak;

               case "K" :
                  $mem *= 1024;
                  // nobreak;
            }
         }
      }

      return $mem;
   }


   /**
    * Check is current memory_limit is enough for GLPI
    *
    * @since 0.83
    *
    * @return integer
    *   0 if PHP not compiled with memory_limit support,
    *   1 no memory limit (memory_limit = -1),
    *   2 insufficient memory for GLPI,
    *   3 enough memory for GLPI
   **/
   static function checkMemoryLimit() {

      $mem = self::getMemoryLimit();
      if ($mem == "") {
         return 0;
      }
      if ($mem == "-1") {
         return 1;
      }
      if ($mem < (64*1024*1024)) {
         return 2;
      }
      return 3;
   }


   /**
    * Check GLPI system requirement.
    *
    * @param boolean $isInstall Is the check run on a install process (don't check DB as not configured yet)
    *
    * @return integer
    *    2 = missing mandatory requirement
    *    1 = missing optional requirement
    *    0 = OK
    */
   static function commonCheckForUseGLPI($isInstall = false) {
      global $DB;

      echo "".__('Test done')."".__('Results')."";

      $core_requirements = (new RequirementsManager())->getCoreRequirementList($isInstall ? null : $DB);
      /* @var \Glpi\System\Requirement\RequirementInterface $requirement */
      foreach ($core_requirements as $requirement) {
         if ($requirement->isOutOfContext()) {
            continue; // skip requirement if not relevant
         }

         echo '';
         echo '' . $requirement->getTitle() . '';

         $class = $requirement->isMissing() && !$requirement->isOptional() ? 'red' : '';
         $pict  = $requirement->isValidated()
            ? 'fas fa-check'
            : ($requirement->isOptional() ? 'fas fa-exclamation-triangle' : 'fas fa-times');
         $messages = Html::entities_deep($requirement->getValidationMessages());

         echo '';
         echo ' ';
         if (!$requirement->isValidated()) {
            echo implode('
', $messages);
         }
         echo '';
         echo '';
      }

      if ($core_requirements->hasMissingMandatoryRequirements()) {
         return 2;
      } else if ($core_requirements->hasMissingOptionalRequirements()) {
         return 1;
      } else {
         return 0;
      }
   }


   /**
    * Check SELinux configuration
    *
    * @since 0.84
    *
    * @param boolean $fordebug  true is displayed in system information
    *
    * @return integer 0: OK, 1:Warning, 2:Error
    *
    * @deprecated 9.5.0
   **/
   static function checkSELinux($fordebug = false) {
      Toolbox::deprecated();

      global $CFG_GLPI;

      if ((DIRECTORY_SEPARATOR != '/')
          || !file_exists('/usr/sbin/getenforce')) {
         // This is not a SELinux system
         return 0;
      }
      if (function_exists('selinux_getenforce')) { // Use https://pecl.php.net/package/selinux
         $mode = selinux_getenforce();
         // Make it human readable, with same output as the command
         if ($mode > 0) {
            $mode = 'Enforcing';
         } else if ($mode < 0) {
            $mode = 'Disabled';
         } else {
            $mode = 'Permissive';
         }
      } else {
         $mode = exec("/usr/sbin/getenforce");
         if (empty($mode)) {
            $mode = "Unknown";
         }
      }
      //TRANS: %s is mode name (Permissive, Enforcing of Disabled)
      $msg  = sprintf(__('SELinux mode is %s'), $mode);
      if ($fordebug) {
         echo "$msg\n";
      } else {
         echo "$msg";
         // All modes should be ok
         echo "";
      }
      if (!strcasecmp($mode, 'Disabled')) {
         // Other test are not useful
         return 0;
      }

      $err = 0;

      // No need to check file context as checkWriteAccessToDirs will show issues

      // Enforcing mode will block some feature (notif, ...)
      // Permissive mode will write lot of stuff in audit.log

      $bools = ['httpd_can_network_connect', 'httpd_can_network_connect_db',
                     'httpd_can_sendmail'];
      $msg2 = __s('Some features may require this to be on');
      foreach ($bools as $bool) {
         if (function_exists('selinux_get_boolean_active')) {
            $state = selinux_get_boolean_active($bool);
            // Make it human readable, with same output as the command
            $state = "$bool --> " . ($state ? 'on' : 'off');
         } else {
            $state = exec('/usr/sbin/getsebool '.$bool);
            if (empty($state)) {
               $state = "$bool --> unknown";
            }
         }
         //TRANS: %s is an option name
         $msg = sprintf(__('SELinux boolean configuration for %s'), $state);
         if ($fordebug) {
            if (substr($state, -2) == 'on') {
               echo "$msg\n";
            } else {
               echo "$msg ($msg2)\n";
            }
         } else {
            if (substr($state, -2) == 'on') {
               echo "$msg";
               echo "".
                    "";
            } else {
               echo "$msg ($msg2)";
               echo "".
                    "";
               $err = 1;
            }
            echo "";
         }
      }

      return $err;
   }


   /**
    * Get the filesize of a complete directory (from php.net)
    *
    * @param string $path  directory or file to get size
    *
    * @return integer
   **/
   static function filesizeDirectory($path) {

      if (!is_dir($path)) {
         return filesize($path);
      }

      if ($handle = opendir($path)) {
         $size = 0;

         while (false !== ($file = readdir($handle))) {
            if (($file != '.') && ($file != '..')) {
               $size += filesize($path.'/'.$file);
               $size += self::filesizeDirectory($path.'/'.$file);
            }
         }

         closedir($handle);
         return $size;
      }
   }


   /** Format a size passing a size in octet
    *
    * @param integer $size  Size in octet
    *
    * @return string  formatted size
   **/
   static function getSize($size) {

      //TRANS: list of unit (o for octet)
      $bytes = [__('o'), __('Kio'), __('Mio'), __('Gio'), __('Tio')];
      foreach ($bytes as $val) {
         if ($size > 1024) {
            $size = $size / 1024;
         } else {
            break;
         }
      }
      //TRANS: %1$s is a number maybe float or string and %2$s the unit
      return sprintf(__('%1$s %2$s'), round($size, 2), $val);
   }


   /**
    * Delete a directory and file contains in it
    *
    * @param string $dir  directory to delete
    *
    * @return void
   **/
   static function deleteDir($dir) {

      if (file_exists($dir)) {
         chmod($dir, 0777);

         if (is_dir($dir)) {
            $id_dir = opendir($dir);
            while (($element = readdir($id_dir)) !== false) {
               if (($element != ".") && ($element != "..")) {

                  if (is_dir($dir."/".$element)) {
                     self::deleteDir($dir."/".$element);
                  } else {
                     unlink($dir."/".$element);
                  }

               }
            }
            closedir($id_dir);
            rmdir($dir);

         } else { // Delete file
            unlink($dir);
         }
      }
   }


   /**
    * Resize a picture to the new size
    * Always produce a JPG file!
    *
    * @since 0.85
    *
    * @param string  $source_path   path of the picture to be resized
    * @param string  $dest_path     path of the new resized picture
    * @param integer $new_width     new width after resized (default 71)
    * @param integer $new_height    new height after resized (default 71)
    * @param integer $img_y         y axis of picture (default 0)
    * @param integer $img_x         x axis of picture (default 0)
    * @param integer $img_width     width of picture (default 0)
    * @param integer $img_height    height of picture (default 0)
    * @param integer $max_size      max size of the picture (default 500, is set to 0 no resize)
    *
    * @return boolean
   **/
   static function resizePicture($source_path, $dest_path, $new_width = 71, $new_height = 71,
                                 $img_y = 0, $img_x = 0, $img_width = 0, $img_height = 0, $max_size = 500) {

      //get img informations (dimensions and extension)
      $img_infos  = getimagesize($source_path);
      if (empty($img_width)) {
         $img_width  = $img_infos[0];
      }
      if (empty($img_height)) {
         $img_height = $img_infos[1];
      }
      if (empty($new_width)) {
         $new_width  = $img_infos[0];
      }
      if (empty($new_height)) {
         $new_height = $img_infos[1];
      }

      // Image max size is 500 pixels : is set to 0 no resize
      if ($max_size>0) {
         if (($img_width > $max_size)
            || ($img_height > $max_size)) {
            $source_aspect_ratio = $img_width / $img_height;
            if ($source_aspect_ratio < 1) {
               $new_width  = $max_size * $source_aspect_ratio;
               $new_height = $max_size;
            } else {
               $new_width  = $max_size;
               $new_height = $max_size / $source_aspect_ratio;
            }
         }
      }

      $img_type = $img_infos[2];

      switch ($img_type) {
         case IMAGETYPE_BMP :
            $source_res = imagecreatefromwbmp($source_path);
            break;

         case IMAGETYPE_GIF :
            $source_res = imagecreatefromgif($source_path);
            break;

         case IMAGETYPE_JPEG :
            $source_res = imagecreatefromjpeg($source_path);
            break;

         case IMAGETYPE_PNG :
            $source_res = imagecreatefrompng($source_path);
            break;

         default :
            return false;
      }

      //create new img resource for store thumbnail
      $source_dest = imagecreatetruecolor($new_width, $new_height);

      // set transparent background for PNG/GIF
      if ($img_type === IMAGETYPE_GIF || $img_type === IMAGETYPE_PNG) {
         imagecolortransparent($source_dest, imagecolorallocatealpha($source_dest, 0, 0, 0, 127));
         imagealphablending($source_dest, false);
         imagesavealpha($source_dest, true);
      }

      //resize image
      imagecopyresampled($source_dest, $source_res, 0, 0, $img_x, $img_y,
                         $new_width, $new_height, $img_width, $img_height);

      //output img
      $result = null;
      switch ($img_type) {
         case IMAGETYPE_GIF :
         case IMAGETYPE_PNG :
            $result = imagepng($source_dest, $dest_path);
            break;

         case IMAGETYPE_JPEG :
         default :
            $result = imagejpeg($source_dest, $dest_path, 90);
            break;
      }
      return $result;
   }


   /**
    * Check if new version is available
    *
    * @return string
   **/
   static function checkNewVersionAvailable() {
      //parse github releases (get last version number)
      $error = "";
      $json_gh_releases = self::getURLContent("https://api.github.com/repos/glpi-project/glpi/releases", $error);
      $all_gh_releases = json_decode($json_gh_releases, true);
      $released_tags = [];
      foreach ($all_gh_releases as $release) {
         if ($release['prerelease'] == false) {
            $released_tags[] =  $release['tag_name'];
         }
      }
      usort($released_tags, 'version_compare');
      $latest_version = array_pop($released_tags);

      if (strlen(trim($latest_version)) == 0) {
         return $error;
      } else {
         $currentVersion = preg_replace('/^((\d+\.?)+).*$/', '$1', GLPI_VERSION);
         if (version_compare($currentVersion, $latest_version, '<')) {
            Config::setConfigurationValues('core', ['founded_new_version' => $latest_version]);
            return sprintf(__('A new version is available: %s.'), $latest_version);
         } else {
            return __('You have the latest available version');
         }
      }
      return 1;
   }


   /**
    * Determine if Imap/Pop is usable checking extension existence
    *
    * @return boolean
    *
    * @deprecated 9.5.0
   **/
   static function canUseImapPop() {
      Toolbox::deprecated('No longer usefull');
      return true;
   }


   /**
    * Determine if Ldap is usable checking ldap extension existence
    *
    * @return boolean
   **/
   static function canUseLdap() {
      return extension_loaded('ldap');
   }


   /**
    * Determine if CAS auth is usable checking lib existence
    *
    * @since 9.3
    *
    * @return boolean
   **/
   static function canUseCas() {
      return class_exists('phpCAS');
   }


   /**
    * Check Write Access to a directory
    *
    * @param string $dir  directory to check
    *
    * @return integer
    *   0: OK,
    *   1: delete error,
    *   2: creation error
   **/
   static function testWriteAccessToDirectory($dir) {

      $rand = rand();

      // Check directory creation which can be denied by SElinux
      $sdir = sprintf("%s/test_glpi_%08x", $dir, $rand);

      if (!mkdir($sdir)) {
         return 4;
      }

      if (!rmdir($sdir)) {
         return 3;
      }

      // Check file creation
      $path = sprintf("%s/test_glpi_%08x.txt", $dir, $rand);
      $fp   = fopen($path, 'w');

      if (empty($fp)) {
         return 2;
      }

      fwrite($fp, "This file was created for testing reasons. ");
      fclose($fp);
      $delete = unlink($path);

      if (!$delete) {
         return 1;
      }

      return 0;
   }


   /**
    * Get form URL for itemtype
    *
    * @param string  $itemtype  item type
    * @param boolean $full      path or relative one
    *
    * return string itemtype Form URL
   **/
   static function getItemTypeFormURL($itemtype, $full = true) {
      global $CFG_GLPI;

      $dir = ($full ? $CFG_GLPI['root_doc'] : '');

      if ($plug = isPluginItemType($itemtype)) {
         /* PluginFooBar => /plugins/foo/front/bar */
         $dir.= Plugin::getPhpDir(strtolower($plug['plugin']), false);
         $item = str_replace('\\', '/', strtolower($plug['class']));

      } else { // Standard case
         $item = strtolower($itemtype);
         if (substr($itemtype, 0, \strlen(NS_GLPI)) === NS_GLPI) {
            $item = str_replace('\\', '/', substr($item, \strlen(NS_GLPI)));
         }
      }

      return "$dir/front/$item.form.php";
   }


   /**
    * Get search URL for itemtype
    *
    * @param string  $itemtype  item type
    * @param boolean $full      path or relative one
    *
    * return string itemtype search URL
   **/
   static function getItemTypeSearchURL($itemtype, $full = true) {
      global $CFG_GLPI;

      $dir = ($full ? $CFG_GLPI['root_doc'] : '');

      if ($plug = isPluginItemType($itemtype)) {
         $dir .= Plugin::getPhpDir(strtolower($plug['plugin']), false);
         $item = str_replace('\\', '/', strtolower($plug['class']));

      } else { // Standard case
         if ($itemtype == 'Cartridge') {
            $itemtype = 'CartridgeItem';
         }
         if ($itemtype == 'Consumable') {
            $itemtype = 'ConsumableItem';
         }
         $item = strtolower($itemtype);
         if (substr($itemtype, 0, \strlen(NS_GLPI)) === NS_GLPI) {
            $item = str_replace('\\', '/', substr($item, \strlen(NS_GLPI)));
         }
      }

      return "$dir/front/$item.php";
   }


   /**
    * Get ajax tabs url for itemtype
    *
    * @param string  $itemtype  item type
    * @param boolean $full      path or relative one
    *
    * return string itemtype tabs URL
   **/
   static function getItemTypeTabsURL($itemtype, $full = true) {
      global $CFG_GLPI;

      $filename = "/ajax/common.tabs.php";

      return ($full ? $CFG_GLPI['root_doc'] : '').$filename;
   }


   /**
    * Get a random string
    *
    * @param integer $length of the random string
    *
    * @return string  random string
    *
    * @see https://stackoverflow.com/questions/4356289/php-random-string-generator/31107425#31107425
   **/
   static function getRandomString($length) {
      $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
      $str = '';
      $max = mb_strlen($keyspace, '8bit') - 1;
      for ($i = 0; $i < $length; ++$i) {
         $str .= $keyspace[random_int(0, $max)];
      }
      return $str;
   }


   /**
    * Split timestamp in time units
    *
    * @param integer $time  timestamp
    *
    * @return array
   **/
   static function getTimestampTimeUnits($time) {

      $out = [];

      $time          = round(abs($time));
      $out['second'] = 0;
      $out['minute'] = 0;
      $out['hour']   = 0;
      $out['day']    = 0;

      $out['second'] = $time%MINUTE_TIMESTAMP;
      $time         -= $out['second'];

      if ($time > 0) {
         $out['minute'] = ($time%HOUR_TIMESTAMP)/MINUTE_TIMESTAMP;
         $time         -= $out['minute']*MINUTE_TIMESTAMP;

         if ($time > 0) {
            $out['hour'] = ($time%DAY_TIMESTAMP)/HOUR_TIMESTAMP;
            $time       -= $out['hour']*HOUR_TIMESTAMP;

            if ($time > 0) {
               $out['day'] = $time/DAY_TIMESTAMP;
            }
         }
      }
      return $out;
   }


   /**
    * Get a web page. Use proxy if configured
    *
    * @param string  $url    URL to retrieve
    * @param string  $msgerr set if problem encountered (default NULL)
    * @param integer $rec    internal use only Must be 0 (default 0)
    *
    * @return string content of the page (or empty)
   **/
   static function getURLContent ($url, &$msgerr = null, $rec = 0) {
      $content = self::callCurl($url);
      return $content;
   }

   /**
    * Executes a curl call
    *
    * @param string $url         URL to retrieve
    * @param array  $eopts       Extra curl opts
    * @param string $msgerr      will contains a human readable error string if an error occurs of url returns empty contents
    * @param string $curl_error  will contains original curl error string if an error occurs
    *
    * @return string
    */
   public static function callCurl($url, array $eopts = [], &$msgerr = null, &$curl_error = null) {
      global $CFG_GLPI;

      $content = "";
      $taburl  = parse_url($url);

      $defaultport = 80;

      // Manage standard HTTPS port : scheme detection or port 443
      if ((isset($taburl["scheme"]) && $taburl["scheme"]=='https')
         || (isset($taburl["port"]) && $taburl["port"]=='443')) {
         $defaultport = 443;
      }

      $ch = curl_init($url);
      $opts = [
         CURLOPT_URL             => $url,
         CURLOPT_USERAGENT       => "GLPI/".trim($CFG_GLPI["version"]),
         CURLOPT_RETURNTRANSFER  => 1
      ] + $eopts;

      if (!empty($CFG_GLPI["proxy_name"])) {
         // Connection using proxy
         $opts += [
            CURLOPT_PROXY           => $CFG_GLPI['proxy_name'],
            CURLOPT_PROXYPORT       => $CFG_GLPI['proxy_port'],
            CURLOPT_PROXYTYPE       => CURLPROXY_HTTP
         ];

         if (!empty($CFG_GLPI["proxy_user"])) {
            $opts += [
               CURLOPT_PROXYAUTH    => CURLAUTH_BASIC,
               CURLOPT_PROXYUSERPWD => $CFG_GLPI["proxy_user"] . ":" . self::sodiumDecrypt($CFG_GLPI["proxy_passwd"]),
            ];
         }

         if ($defaultport == 443) {
            $opts += [
               CURLOPT_HTTPPROXYTUNNEL => 1
            ];
         }
      }

      curl_setopt_array($ch, $opts);
      $content = curl_exec($ch);
      $curl_error = curl_error($ch) ?: null;
      curl_close($ch);

      if ($curl_error !== null) {
         if (empty($CFG_GLPI["proxy_name"])) {
            //TRANS: %s is the error string
            $msgerr = sprintf(
               __('Connection failed. If you use a proxy, please configure it. (%s)'),
               $curl_error
            );
         } else {
            //TRANS: %s is the error string
            $msgerr = sprintf(
               __('Failed to connect to the proxy server (%s)'),
               $curl_error
            );
         }
         $content = '';
      } else if (empty($content)) {
         $msgerr = __('No data available on the web site');
      }
      if (!empty($msgerr)) {
         Toolbox::logError($msgerr);
      }
      return $content;
   }

   /**
    * Returns whether this is an AJAX (XMLHttpRequest) request.
    *
    * @return boolean whether this is an AJAX (XMLHttpRequest) request.
    */
   static function isAjax() {
      return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] === 'XMLHttpRequest';
   }


   /**
    * @param $need
    * @param $tab
    *
    * @return boolean
   **/
   static function key_exists_deep($need, $tab) {

      foreach ($tab as $key => $value) {

         if ($need == $key) {
            return true;
         }

         if (is_array($value)
             && self::key_exists_deep($need, $value)) {
            return true;
         }

      }
      return false;
   }


   /**
    * Manage planning posted datas (must have begin + duration or end)
    * Compute end if duration is set
    *
    * @param array $data  data to process
    *
    * @return void
   **/
   static function manageBeginAndEndPlanDates(&$data) {

      if (!isset($data['end'])) {
         if (isset($data['begin'])
             && isset($data['_duration'])) {
            $begin_timestamp = strtotime($data['begin']);
            $data['end']     = date("Y-m-d H:i:s", $begin_timestamp+$data['_duration']);
            unset($data['_duration']);
         }
      }
   }


   /**
    * Manage login redirection
    *
    * @param string $where  where to redirect ?
    *
    * @return void
   **/
   static function manageRedirect($where) {
      global $CFG_GLPI;

      if (!empty($where)) {

         if (Session::getCurrentInterface()) {
            // redirect to URL : URL must be rawurlencoded
            $decoded_where = rawurldecode($where);
            $matches = [];

            // redirect to full url -> check if it's based on glpi url
            if (preg_match('@(([^:/].+:)?//[^/]+)(/.+)?@', $decoded_where, $matches)) {
               if ($matches[1] !== $CFG_GLPI['url_base']) {
                  Session::addMessageAfterRedirect('Redirection failed');
                  if (Session::getCurrentInterface() === "helpdesk") {
                     Html::redirect($CFG_GLPI["root_doc"]."/front/helpdesk.public.php");
                  } else {
                     Html::redirect($CFG_GLPI["root_doc"]."/front/central.php");
                  }
               } else {
                  Html::redirect($decoded_where);
               }
            }

            // Redirect to relative url -> redirect with glpi url to prevent exploits
            if ($decoded_where[0] == '/') {
               $redirect_to = $CFG_GLPI["url_base"].$decoded_where;
               //echo $redirect_to; exit();
               Html::redirect($redirect_to);
            }

            $data = explode("_", $where);
            $forcetab = '';
            // forcetab for simple items
            if (isset($data[2])) {
               $forcetab = 'forcetab='.$data[2];
            }

            switch (Session::getCurrentInterface()) {
               case "helpdesk" :
                  switch (strtolower($data[0])) {
                     // Use for compatibility with old name
                     case "tracking" :
                     case "ticket" :
                        $data[0] = 'Ticket';
                        // redirect to item
                        if (isset($data[1])
                            && is_numeric($data[1])
                            && ($data[1] > 0)) {
                           // Check entity
                           if (($item = getItemForItemtype($data[0]))
                               && $item->isEntityAssign()) {
                              if ($item->getFromDB($data[1])) {
                                 if (!Session::haveAccessToEntity($item->getEntityID())) {
                                    Session::changeActiveEntities($item->getEntityID(), 1);
                                 }
                              }
                           }
                           // force redirect to timeline when timeline is enabled and viewing
                           // Tasks or Followups
                           $forcetab = str_replace( 'TicketFollowup$1', 'Ticket$1', $forcetab);
                           $forcetab = str_replace( 'TicketTask$1', 'Ticket$1', $forcetab);
                           $forcetab = str_replace( 'ITILFollowup$1', 'Ticket$1', $forcetab);
                           Html::redirect(Ticket::getFormURLWithID($data[1])."&$forcetab");

                        } else if (!empty($data[0])) { // redirect to list
                           if ($item = getItemForItemtype($data[0])) {
                              $searchUrl = $item->getSearchURL();
                              $searchUrl .= strpos($searchUrl, '?') === false ? '?' : '&';
                              $searchUrl .= $forcetab;
                              Html::redirect($searchUrl);
                           }
                        }

                        Html::redirect($CFG_GLPI["root_doc"]."/front/helpdesk.public.php");
                        break;

                     case "preference" :
                        Html::redirect($CFG_GLPI["root_doc"]."/front/preference.php?$forcetab");
                        break;

                     case "reservation" :
                        Html::redirect(Reservation::getFormURLWithID($data[1])."&$forcetab");
                        break;

                     default :
                        Html::redirect($CFG_GLPI["root_doc"]."/front/helpdesk.public.php");
                        break;
                  }
                  break;

               case "central" :
                  switch (strtolower($data[0])) {
                     case "preference" :
                        Html::redirect($CFG_GLPI["root_doc"]."/front/preference.php?$forcetab");
                        break;

                     // Use for compatibility with old name
                     // no break
                     case "tracking" :
                        $data[0] = "Ticket";

                     default :
                        // redirect to item
                        if (!empty($data[0] )
                            && isset($data[1])
                            && is_numeric($data[1])
                            && ($data[1] > 0)) {
                           // Check entity
                           if ($item = getItemForItemtype($data[0])) {
                              if ($item->isEntityAssign()) {
                                 if ($item->getFromDB($data[1])) {
                                    if (!Session::haveAccessToEntity($item->getEntityID())) {
                                       Session::changeActiveEntities($item->getEntityID(), 1);
                                    }
                                 }
                              }
                              // force redirect to timeline when timeline is enabled
                              $forcetab = str_replace( 'TicketFollowup$1', 'Ticket$1', $forcetab);
                              $forcetab = str_replace( 'TicketTask$1', 'Ticket$1', $forcetab);
                              $forcetab = str_replace( 'ITILFollowup$1', 'Ticket$1', $forcetab);
                              Html::redirect($item->getFormURLWithID($data[1])."&$forcetab");
                           }

                        } else if (!empty($data[0])) { // redirect to list
                           if ($item = getItemForItemtype($data[0])) {
                              $searchUrl = $item->getSearchURL();
                              $searchUrl .= strpos($searchUrl, '?') === false ? '?' : '&';
                              $searchUrl .= $forcetab;
                              Html::redirect($searchUrl);
                           }
                        }

                        Html::redirect($CFG_GLPI["root_doc"]."/front/central.php");
                        break;
                  }
                  break;
            }
         }
      }
   }


   /**
    * Convert a value in byte, kbyte, megabyte etc...
    *
    * @param string $val  config value (like 10k, 5M)
    *
    * @return integer $val
   **/
   static function return_bytes_from_ini_vars($val) {

      $val  = trim($val);
      $last = self::strtolower($val[strlen($val)-1]);
      $val  = (int)$val;

      switch ($last) {
         // Le modifieur 'G' est disponible depuis PHP 5.1.0
         case 'g' :
            $val *= 1024;
            // no break;

         case 'm' :
            $val *= 1024;
            // no break;

         case 'k' :
            $val *= 1024;
            // no break;
      }

      return $val;
   }

   /**
    * Parse imap open connect string
    *
    * @since 0.84
    *
    * @param string  $value      connect string
    * @param boolean $forceport  force compute port if not set
    *
    * @return array  parsed arguments (address, port, mailbox, type, ssl, tls, validate-cert
    *                norsh, secure and debug) : options are empty if not set
    *                and options have boolean values if set
   **/
   static function parseMailServerConnectString($value, $forceport = false) {

      $tab = [];
      if (strstr($value, ":")) {
         $tab['address'] = str_replace("{", "", preg_replace("/:.*/", "", $value));
         $tab['port']    = preg_replace("/.*:/", "", preg_replace("/\/.*/", "", $value));

      } else {
         if (strstr($value, "/")) {
            $tab['address'] = str_replace("{", "", preg_replace("/\/.*/", "", $value));
         } else {
            $tab['address'] = str_replace("{", "", preg_replace("/}.*/", "", $value));
         }
         $tab['port'] = "";
      }
      $tab['mailbox'] = preg_replace("/.*}/", "", $value);

      // type follows first found "/" and ends on next "/" (or end of server string)
      // server string is surrounded by "{}" and can be followed by a folder name
      // i.e. "{mail.domain.org/imap/ssl}INBOX", or "{mail.domain.org/pop}"
      $type = preg_replace('/^\{[^\/]+\/([^\/]+)(?:\/.+)*\}.*/', '$1', $value);
      $tab['type'] = in_array($type, array_keys(self::getMailServerProtocols())) ? $type : '';

      $tab['ssl'] = false;
      if (strstr($value, "/ssl")) {
         $tab['ssl'] = true;
      }

      if ($forceport && empty($tab['port'])) {
         if ($tab['type'] == 'pop') {
            if ($tab['ssl']) {
               $tab['port'] = 110;
            } else {
               $tab['port'] = 995;
            }
         }
         if ($tab['type'] = 'imap') {
            if ($tab['ssl']) {
               $tab['port'] = 993;
            } else {
               $tab['port'] = 143;
            }
         }
      }
      $tab['tls'] = '';
      if (strstr($value, "/tls")) {
         $tab['tls'] = true;
      }
      if (strstr($value, "/notls")) {
         $tab['tls'] = false;
      }
      $tab['validate-cert'] = '';
      if (strstr($value, "/validate-cert")) {
         $tab['validate-cert'] = true;
      }
      if (strstr($value, "/novalidate-cert")) {
         $tab['validate-cert'] = false;
      }
      $tab['norsh'] = '';
      if (strstr($value, "/norsh")) {
         $tab['norsh'] = true;
      }
      $tab['secure'] = '';
      if (strstr($value, "/secure")) {
         $tab['secure'] = true;
      }
      $tab['debug'] = '';
      if (strstr($value, "/debug")) {
         $tab['debug'] = true;
      }

      return $tab;
   }


   /**
    * Display a mail server configuration form
    *
    * @param string $value  host connect string ex {localhost:993/imap/ssl}INBOX
    *
    * @return string  type of the server (imap/pop)
   **/
   static function showMailServerConfig($value) {

      if (!Config::canUpdate()) {
         return false;
      }

      $tab = Toolbox::parseMailServerConnectString($value);

      echo "" . __('Server') . "";
      echo "";
      echo "\n";

      echo "" . __('Connection options') . "";
      $values = [];
      $protocols = Toolbox::getMailServerProtocols();
      foreach ($protocols as $key => $params) {
         $values['/' . $key] = $params['label'];
      }
      $svalue = (!empty($tab['type'])?'/'.$tab['type']:'');

      Dropdown::showFromArray('server_type', $values,
                              ['value'               => $svalue,
                                    'display_emptychoice' => true]);
      $values = [//TRANS: imap_open option see http://www.php.net/manual/en/function.imap-open.php
                     '/ssl' => __('SSL')];

      $svalue = ($tab['ssl']?'/ssl':'');

      Dropdown::showFromArray('server_ssl', $values,
                              ['value'               => $svalue,
                                    'display_emptychoice' => true]);

      $values = [//TRANS: imap_open option see http://www.php.net/manual/en/function.imap-open.php
                     '/tls' => __('TLS'),
                     //TRANS: imap_open option see http://www.php.net/manual/en/function.imap-open.php
                     '/notls' => __('NO-TLS'),];

      $svalue = '';
      if (($tab['tls'] === true)) {
         $svalue = '/tls';
      }
      if (($tab['tls'] === false)) {
         $svalue = '/notls';
      }

      Dropdown::showFromArray('server_tls', $values,
                              ['value'               => $svalue,
                                    'width'               => '14%',
                                    'display_emptychoice' => true]);

      $values = [//TRANS: imap_open option see http://www.php.net/manual/en/function.imap-open.php
                     '/novalidate-cert' => __('NO-VALIDATE-CERT'),
                     //TRANS: imap_open option see http://www.php.net/manual/en/function.imap-open.php
                     '/validate-cert' => __('VALIDATE-CERT'),];

      $svalue = '';
      if (($tab['validate-cert'] === false)) {
         $svalue = '/novalidate-cert';
      }
      if (($tab['validate-cert'] === true)) {
         $svalue = '/validate-cert';
      }

      Dropdown::showFromArray('server_cert', $values,
                              ['value'               => $svalue,
                                    'display_emptychoice' => true]);

      $values = [//TRANS: imap_open option see http://www.php.net/manual/en/function.imap-open.php
                     '/norsh' => __('NORSH')];

      $svalue = ($tab['norsh'] === true?'/norsh':'');

      Dropdown::showFromArray('server_rsh', $values,
                              ['value'               => $svalue,
                                    'display_emptychoice' => true]);

      $values = [//TRANS: imap_open option see http://www.php.net/manual/en/function.imap-open.php
                     '/secure' => __('SECURE')];

      $svalue = ($tab['secure'] === true?'/secure':'');

      Dropdown::showFromArray('server_secure', $values,
                              ['value'               => $svalue,
                                    'display_emptychoice' => true]);

      $values = [//TRANS: imap_open option see http://www.php.net/manual/en/function.imap-open.php
                     '/debug' => __('DEBUG')];

      $svalue = ($tab['debug'] === true?'/debug':'');

      Dropdown::showFromArray('server_debug', $values,
                              ['value'               => $svalue,
                                    'width'               => '12%',
                                    'display_emptychoice' => true]);

      echo "";
      echo "\n";

      if ($tab['type'] != 'pop') {
         echo "". __('Incoming mail folder (optional, often INBOX)')."";
         echo "";
         echo "";
         echo "";
         echo "\n";
      }

      //TRANS: for mail connection system
      echo "" . __('Port (optional)') . "";
      echo "\n";
      if (empty($value)) {
         $value = " ";
      }
      //TRANS: for mail connection system
      echo "" . __('Connection string') . "";
      echo "$value\n";

      return $tab['type'];
   }


   /**
    * @param array $input
    *
    * @return string
   **/
   static function constructMailServerConfig($input) {

      $out = "";
      if (isset($input['mail_server']) && !empty($input['mail_server'])) {
         $out .= "{" . $input['mail_server'];
      } else {
         return $out;
      }
      if (isset($input['server_port']) && !empty($input['server_port'])) {
         $out .= ":" . $input['server_port'];
      }
      if (isset($input['server_type']) && !empty($input['server_type'])) {
         $out .= $input['server_type'];
      }
      if (isset($input['server_ssl']) && !empty($input['server_ssl'])) {
         $out .= $input['server_ssl'];
      }
      if (isset($input['server_cert']) && !empty($input['server_cert'])) {
         $out .= $input['server_cert'];
      }
      if (isset($input['server_tls']) && !empty($input['server_tls'])) {
         $out .= $input['server_tls'];
      }

      if (isset($input['server_rsh']) && !empty($input['server_rsh'])) {
         $out .= $input['server_rsh'];
      }
      if (isset($input['server_secure']) && !empty($input['server_secure'])) {
         $out .= $input['server_secure'];
      }
      if (isset($input['server_debug']) && !empty($input['server_debug'])) {
         $out .= $input['server_debug'];
      }
      $out .= "}";
      if (isset($input['server_mailbox']) && !empty($input['server_mailbox'])) {
         $out .= $input['server_mailbox'];
      }

      return $out;
   }

   /**
    * Retuns available mail servers protocols.
    *
    * For each returned element:
    *  - key is type used in connection string;
    *  - 'label' field is the label to display;
    *  - 'protocol_class' field is the protocol class to use (see Laminas\Mail\Protocol\Imap | Laminas\Mail\Protocol\Pop3);
    *  - 'storage_class' field is the storage class to use (see Laminas\Mail\Storage\Imap | Laminas\Mail\Storage\Pop3).
    *
    * @return array
    */
   private static function getMailServerProtocols(): array {
      $protocols = [
         'imap' => [
            //TRANS: IMAP mail server protocol
            'label'    => __('IMAP'),
            'protocol' => 'Laminas\Mail\Protocol\Imap',
            'storage'  => 'Laminas\Mail\Storage\Imap',
         ],
         'pop'  => [
            //TRANS: POP3 mail server protocol
            'label'    => __('POP'),
            'protocol' => 'Laminas\Mail\Protocol\Pop3',
            'storage'  => 'Laminas\Mail\Storage\Pop3',
         ]
      ];

      $additionnal_protocols = Plugin::doHookFunction('mail_server_protocols', []);
      if (is_array($additionnal_protocols)) {
         foreach ($additionnal_protocols as $key => $additionnal_protocol) {
            if (array_key_exists($key, $protocols)) {
               trigger_error(
                  sprintf('Protocol "%s" is already defined and cannot be overwritten.', $key),
                  E_USER_WARNING
               );
               continue; // already exists, do not overwrite
            }

            if (!array_key_exists('label', $additionnal_protocol)
                || !array_key_exists('protocol', $additionnal_protocol)
                || !array_key_exists('storage', $additionnal_protocol)) {
               trigger_error(
                  sprintf('Invalid specs for protocol "%s".', $key),
                  E_USER_WARNING
               );
               continue;
            }
            $protocols[$key] = $additionnal_protocol;
         }
      } else {
         trigger_error(
            'Invalid value returned by "mail_server_protocols" hook.',
            E_USER_WARNING
         );
      }

      return $protocols;
   }

   /**
    * Returns protocol instance for given mail server type.
    *
    * Class should implements Glpi\Mail\Protocol\ProtocolInterface
    * or should be \Laminas\Mail\Protocol\Imap|\Laminas\Mail\Protocol\Pop3 for native protocols.
    *
    * @param string $protocol_type
    *
    * @return null|\Glpi\Mail\Protocol\ProtocolInterface|\Laminas\Mail\Protocol\Imap|\Laminas\Mail\Protocol\Pop3
    */
   public static function getMailServerProtocolInstance(string $protocol_type) {
      $protocols = self::getMailServerProtocols();
      if (array_key_exists($protocol_type, $protocols)) {
         $protocol = $protocols[$protocol_type]['protocol'];
         if (is_callable($protocol)) {
            return call_user_func($protocol);
         } else if (class_exists($protocol)
             && (is_a($protocol, ProtocolInterface::class, true)
                 || is_a($protocol, \Laminas\Mail\Protocol\Imap::class, true)
                 || is_a($protocol, \Laminas\Mail\Protocol\Pop3::class, true))) {
            return new $protocol();
         } else {
            trigger_error(
               sprintf('Invalid specs for protocol "%s".', $protocol_type),
               E_USER_WARNING
            );
         }
      }
      return null;
   }

   /**
    * Returns storage instance for given mail server type.
    *
    * Class should extends \Laminas\Mail\Storage\AbstractStorage.
    *
    * @param string $protocol_type
    * @param array  $params         Storage constructor params, as defined in AbstractStorage
    *
    * @return null|AbstractStorage
    */
   public static function getMailServerStorageInstance(string $protocol_type, array $params): ?AbstractStorage {
      $protocols = self::getMailServerProtocols();
      if (array_key_exists($protocol_type, $protocols)) {
         $storage = $protocols[$protocol_type]['storage'];
         if (is_callable($storage)) {
            return call_user_func($storage, $params);
         } else if (class_exists($storage) && is_a($storage, AbstractStorage::class, true)) {
            return new $storage($params);
         } else {
            trigger_error(
               sprintf('Invalid specs for protocol "%s".', $protocol_type),
               E_USER_WARNING
            );
         }
      }
      return null;
   }

   /**
    * @return string[]
    */
   static function getDaysOfWeekArray() {

      $tab = [];

      $tab[0] = __("Sunday");
      $tab[1] = __("Monday");
      $tab[2] = __("Tuesday");
      $tab[3] = __("Wednesday");
      $tab[4] = __("Thursday");
      $tab[5] = __("Friday");
      $tab[6] = __("Saturday");

      return $tab;
   }

   /**
    * @return string[]
    */
   static function getMonthsOfYearArray() {

      $tab = [];

      $tab[1]  = __("January");
      $tab[2]  = __("February");
      $tab[3]  = __("March");
      $tab[4]  = __("April");
      $tab[5]  = __("May");
      $tab[6]  = __("June");
      $tab[7]  = __("July");
      $tab[8]  = __("August");
      $tab[9]  = __("September");
      $tab[10] = __("October");
      $tab[11] = __("November");
      $tab[12] = __("December");

      return $tab;
   }


   /**
    * Do a in_array search comparing string using strcasecmp
    *
    * @since 0.84
    *
    * @param string $string  string to search
    * @param array  $data    array to search in
    *
    * @return boolean  string found ?
   **/
   static function inArrayCaseCompare($string, $data = []) {

      if (count($data)) {
         foreach ($data as $tocheck) {
            if (strcasecmp($string, $tocheck) == 0) {
               return true;
            }
         }
      }
      return false;
   }


   /**
    * Clean integer string value (strip all chars not - and spaces )
    *
    * @since versin 0.83.5
    *
    * @param string  $integer  integer string
    *
    * @return string  clean integer
   **/
   static function cleanInteger($integer) {
      return preg_replace("/[^0-9-]/", "", $integer);
   }


   /**
    * Clean decimal string value (strip all chars not - and spaces )
    *
    * @since versin 0.83.5
    *
    * @param string $decimal  float string
    *
    * @return string  clean decimal
   **/
   static function cleanDecimal($decimal) {
      return preg_replace("/[^0-9\.-]/", "", $decimal);
   }


   /**
    * Clean new lines of a string
    *
    * @since versin 0.85
    *
    * @param string $string  string to clean
    *
    * @return string  clean string
   **/
   static function cleanNewLines($string) {

      $string = preg_replace("/\r\n/", " ", $string);
      $string = preg_replace("/\n/", " ", $string);
      $string = preg_replace("/\r/", " ", $string);
      return $string;
   }


   /**
    * Create the GLPI default schema
    *
    * @param string  $lang Language to install
    * @param DBmysql $db   Database instance to use, will fallback to a new instance of DB if null
    *
    * @return void
    *
    * @since 9.1
    * @since 9.4.7 Added $db parameter
   **/
   static function createSchema($lang = 'en_GB', DBmysql $database = null) {
      global $DB;

      if (null === $database) {
         // Use configured DB if no $db is defined in parameters
         include_once (GLPI_CONFIG_DIR . "/config_db.php");
         $database = new DB();
      }

      // Set global $DB as it is used in "Config::setConfigurationValues()" just after schema creation
      $DB = $database;

      if (!$DB->runFile(GLPI_ROOT ."/install/mysql/glpi-empty.sql")) {
         echo "Errors occurred inserting default database";
      } else {
         //dataset
         Session::loadLanguage($lang, false); // Load default language locales to translate empty data
         $tables = require_once(__DIR__ . '/../install/empty_data.php');
         Session::loadLanguage('', false); // Load back session language

         foreach ($tables as $table => $data) {
            $reference = array_replace(
               $data[0],
               array_fill_keys(
                  array_keys($data[0]),
                  new QueryParam()
               )
            );

            $stmt = $DB->prepare($DB->buildInsert($table, $reference));
            if (false === $stmt) {
               $msg = "Error preparing statement in table $table";
               throw new \RuntimeException($msg);
            }

            $types = str_repeat('s', count($data[0]));
            foreach ($data as $row) {
               $res = $stmt->bind_param($types, ...array_values($row));
               if (false === $res) {
                  $msg = "Error binding params in table $table\n";
                  $msg .= print_r($row, true);
                  throw new \RuntimeException($msg);
               }
               $res = $stmt->execute();
               if (false === $res) {
                  $msg = $stmt->error;
                  $msg .= "\nError execution statement in table $table\n";
                  $msg .= print_r($row, true);
                  throw new \RuntimeException($msg);
               }
               if (!isCommandLine()) {
                  // Flush will prevent proxy to timeout as it will receive data.
                  // Flush requires a content to be sent, so we sent spaces as multiple spaces
                  // will be shown as a single one on browser.
                  echo ' ';
                  Html::glpi_flush();
               }
            }
         }

         // update default language
         Config::setConfigurationValues(
            'core',
            [
               'language'      => $lang,
               'version'       => GLPI_VERSION,
               'dbversion'     => GLPI_SCHEMA_VERSION,
               'use_timezones' => $DB->areTimezonesAvailable()
            ]
         );

         if (defined('GLPI_SYSTEM_CRON')) {
            // Downstream packages may provide a good system cron
            $DB->updateOrDie(
               'glpi_crontasks', [
                  'mode'   => 2
               ], [
                  'name'      => ['!=', 'watcher'],
                  'allowmode' => ['&', 2]
               ],
               '4203'
            );
         }
      }
   }


   /**
    * Save a configuration file
    *
    * @since 0.84
    *
    * @param string $name     config file name
    * @param string $content  config file content
    *
    * @return boolean
   **/
   static function writeConfig($name, $content) {

      $name = GLPI_CONFIG_DIR . '/'.$name;
      $fp   = fopen($name, 'wt');
      if ($fp) {
         $fw = fwrite($fp, $content);
         fclose($fp);
         if (function_exists('opcache_invalidate')) {
            /* Invalidate Zend OPcache to ensure saved version used */
            opcache_invalidate($name, true);
         }
         return ($fw>0);
      }
      return false;
   }


   /**
    * Prepare array passed on an input form
    *
    * @param array $value  passed array
    *
    * @return string  encoded array
    *
    * @since 0.83.91
   **/
   static function prepareArrayForInput(array $value) {
      return base64_encode(json_encode($value));
   }


   /**
    * Decode array passed on an input form
    *
    * @param string $value  encoded value
    *
    * @return string  decoded array
    *
    * @since 0.83.91
   **/
   static function decodeArrayFromInput($value) {

      if ($dec = base64_decode($value)) {
         if ($ret = json_decode($dec, true)) {
            return $ret;
         }
      }
      return [];
   }


   /**
    * Check valid referer accessing GLPI
    *
    * @since 0.84.2
    *
    * @return void  display error if not permit
   **/
   static function checkValidReferer() {
      global $CFG_GLPI;

      $isvalidReferer = true;

      if (!isset($_SERVER['HTTP_REFERER'])) {
         if ($_SESSION['glpi_use_mode'] == Session::DEBUG_MODE) {
            Html::displayErrorAndDie(__("No HTTP_REFERER found in request. Reload previous page before doing action again."),
                                  true);
            $isvalidReferer = false;
         }
      } else if (!is_array($url = parse_url($_SERVER['HTTP_REFERER']))) {
         if ($_SESSION['glpi_use_mode'] == Session::DEBUG_MODE) {
            Html::displayErrorAndDie(__("Error when parsing HTTP_REFERER. Reload previous page before doing action again."),
                                  true);
            $isvalidReferer = false;
         }
      }

      if (!isset($url['host'])
          || (($url['host'] != $_SERVER['SERVER_NAME'])
            && (!isset($_SERVER['HTTP_X_FORWARDED_SERVER'])
               || ($url['host'] != $_SERVER['HTTP_X_FORWARDED_SERVER'])))) {
         if ($_SESSION['glpi_use_mode'] == Session::DEBUG_MODE) {
            Html::displayErrorAndDie(__("None or Invalid host in HTTP_REFERER. Reload previous page before doing action again."),
                                  true);
            $isvalidReferer = false;
         }
      }

      if (!isset($url['path'])
          || (!empty($CFG_GLPI['root_doc'])
            && (strpos($url['path'], $CFG_GLPI['root_doc']) !== 0))) {
         if ($_SESSION['glpi_use_mode'] == Session::DEBUG_MODE) {
            Html::displayErrorAndDie(__("None or Invalid path in HTTP_REFERER. Reload previous page before doing action again."),
                                  true);
            $isvalidReferer = false;
         }
      }

      if (!$isvalidReferer && $_SESSION['glpi_use_mode'] != Session::DEBUG_MODE) {
            Html::displayErrorAndDie(__("The action you have requested is not allowed. Reload previous page before doing action again."),
                                  true);
      }
   }


   /**
    * Retrieve the mime type of a file
    *
    * @since 0.85.5
    *
    * @param string         $file  path of the file
    * @param boolean|string $type  check if $file is the correct type
    *
    * @return boolean|string (if $type not given) else boolean
    *
   **/
   static function getMime($file, $type = false) {

      static $finfo = null;

      if (is_null($finfo)) {
         $finfo = new finfo(FILEINFO_MIME_TYPE);
      }
      $mime = $finfo->file($file);
      if ($type) {
         $parts = explode('/', $mime, 2);
         return ($parts[0] == $type);
      }
      return ($mime);
   }


   /**
    * Summary of in_array_recursive
    *
    * @since 9.1
    *
    * @param mixed $needle
    * @param array $haystack
    * @param bool  $strict: If strict is set to TRUE then it will also
    *              check the types of the needle in the haystack.
    * @return bool
    */
   static function in_array_recursive($needle, $haystack, $strict = false) {

      $it = new RecursiveIteratorIterator(new RecursiveArrayIterator($haystack));

      foreach ($it AS $element) {
         if ($strict) {
            if ($element === $needle) {
               return true;
            }
         } else {
            if ($element == $needle) {
               return true;
            }
         }
      }
      return false;
   }

   /**
    * Sanitize received values
    *
    * @param array $array
    *
    * @return array
    */
   static public function sanitize($array) {
      $array = array_map('Toolbox::addslashes_deep', $array);
      $array = array_map('Toolbox::clean_cross_side_scripting_deep', $array);
      return $array;
   }

   /**
    * Remove accentued characters and return lower case string
    *
    * @param string $string String to handle
    *
    * @return string
    */
   public static function removeHtmlSpecialChars($string) {
      $string = htmlentities($string, ENT_NOQUOTES, 'utf-8');
      $string = preg_replace(
         '#&([A-za-z])(?:acute|cedil|caron|circ|grave|orn|ring|slash|th|tilde|uml);#',
         '\1',
         $string
      );
      $string = preg_replace('#&([A-za-z]{2})(?:lig);#', '\1', $string);
      $string = preg_replace('#&[^;]+;#', '', $string);
      return self::strtolower($string, 'UTF-8');
   }

   /**
    * Slugify
    *
    * @param string $string String to slugify
    *
    * @return string
    */
   public static function slugify($string) {
       //SOPHAL
      //$string = transliterator_transliterate("Any-Latin; NFD; [:Nonspacing Mark:] Remove; NFC; [:Punctuation:] Remove; Lower();", $string);
      $string = str_replace(' ', '-', self::strtolower($string, 'UTF-8'));
      $string = self::removeHtmlSpecialChars($string);
      $string = preg_replace('~[^0-9a-z]+~i', '-', $string);
      $string = trim($string, '-');
      if ($string == '') {
         //prevent empty slugs; see https://github.com/glpi-project/glpi/issues/2946
         //harcoded prefix string because html @id must begin with a letter
         $string = 'nok_' . Toolbox::getRandomString(10);
      } else if (ctype_digit(substr($string, 0, 1))) {
         //starts with a number; not ok to be used as an html id attribute
         $string = 'slug_' . $string;
      }
      return $string;
   }

   /**
    * Convert tag to image
    *
    * @since 9.2
    *
    * @param string $content_text   text content of input
    * @param CommonDBTM $item       Glpi item where to convert image tag to image document
    * @param array $doc_data        list of filenames and tags
    *
    * @return string                the $content_text param after parsing
   **/
   static function convertTagToImage($content_text, CommonDBTM $item, $doc_data = []) {
      global $CFG_GLPI;

      $document = new Document();
      $matches  = [];
      // If no doc data available we match all tags in content
      if (!count($doc_data)) {
         preg_match_all('/'.Document::getImageTag('(([a-z0-9]+|[\.\-]?)+)').'/', $content_text,
                        $matches, PREG_PATTERN_ORDER);
         if (isset($matches[1]) && count($matches[1])) {
            $doc_data = $document->find(['tag' => array_unique($matches[1])]);
         }
      }

      if (count($doc_data)) {
         $base_path = $CFG_GLPI['root_doc'];
         if (isCommandLine()) {
            $base_path = parse_url($CFG_GLPI['url_base'], PHP_URL_PATH);
         }

         foreach ($doc_data as $id => $image) {
            if (isset($image['tag'])) {
               // Add only image files : try to detect mime type
               if ($document->getFromDB($id)
                   && strpos($document->fields['mime'], 'image/') !== false) {
                  // append itil object reference in image link
                  $itil_object = null;
                  if ($item instanceof CommonITILObject) {
                     $itil_object = $item;
                  } else if (isset($item->input['_job'])
                             && $item->input['_job'] instanceof CommonITILObject) {
                     $itil_object = $item->input['_job'];
                  }
                  $itil_url_param = null !== $itil_object
                     ? "&{$itil_object->getForeignKeyField()}={$itil_object->fields['id']}"
                     : "";
                  $img = "";

                  // 1 - Replace direct tag (with prefix and suffix) by the image
                  $content_text = preg_replace('/'.Document::getImageTag($image['tag']).'/',
                                               Html::entities_deep($img), $content_text);

                  // 2 - Replace img with tag in id attribute by the image
                  $regex = '/]+' . preg_quote($image['tag'], '/') . '[^<]+>/im';
                  preg_match_all($regex, Html::entity_decode_deep($content_text), $matches);
                  foreach ($matches[0] as $match_img) {
                     //retrieve dimensions
                     $width = $height = null;
                     $attributes = [];
                     preg_match_all('/(width|height)=\\\"([^"]*)\\\"/i', $match_img, $attributes);
                     if (isset($attributes[1][0])) {
                        ${$attributes[1][0]} = $attributes[2][0];
                     }
                     if (isset($attributes[1][1])) {
                        ${$attributes[1][1]} = $attributes[2][1];
                     }

                     if ($width == null || $height == null) {
                        $path = GLPI_DOC_DIR."/".$image['filepath'];
                        $img_infos  = getimagesize($path);
                        $width = $img_infos[0];
                        $height = $img_infos[1];
                     }

                     // replace image
                     $new_image =  Html::getImageHtmlTagForDocument(
                        $id,
                        $width,
                        $height,
                        true,
                        $itil_url_param
                     );
                     if (empty($new_image)) {
                        $new_image = '#'.$image['tag'].'#';
                     }
                     $content_text = str_replace(
                        $match_img,
                        $new_image,
                        Html::entity_decode_deep($content_text)
                     );
                     $content_text = Html::entities_deep($content_text);
                  }

                  // Replace 
 TinyMce bug
                  $content_text = str_replace(['>rn<','>\r\n<','>\r<','>\n<'],
                                              '><', $content_text);

                  // If the tag is from another ticket : link document to ticket
                  if ($item instanceof Ticket
                     && $item->getID()
                     && isset($image['tickets_id'])
                     && $image['tickets_id'] != $item->getID()) {
                     $docitem = new Document_Item();
                     $docitem->add(['documents_id'  => $image['id'],
                                         '_do_notif'     => false,
                                         '_disablenotif' => true,
                                         'itemtype'      => $item->getType(),
                                         'items_id'      => $item->fields['id']]);
                  }
               } else {
                  // Remove tag
                  $content_text = preg_replace('/'.Document::getImageTag($image['tag']).'/',
                                               '', $content_text);
               }
            }
         }
      }

      return $content_text;
   }

   /**
    * Convert image to tag
    *
    * @since 9.2
    *
    * @param string $content_html   html content of input
    * @param boolean $force_update  force update of content in item
    *
    * @return string  html content
   **/
   static function convertImageToTag($content_html, $force_update = false) {

      if (!empty($content_html)) {
         $matches = [];
         preg_match_all("/alt\s*=\s*['|\"](.+?)['|\"]/", $content_html, $matches, PREG_PATTERN_ORDER);
         if (isset($matches[1]) && count($matches[1])) {
            // Get all image src
            foreach ($matches[1] as $src) {
               // Set tag if image matches
               $content_html = preg_replace(["/]*\>/", "/]*\>/"], Document::getImageTag($src), $content_html);
            }
         }

         return $content_html;
      }
   }

   /**
    * Delete tag or image from ticket content
    *
    * @since 9.2
    *
    * @param string $content   html content of input
    * @param array $tags       list of tags to clen
    *
    * @return string  html content
   **/
   static function cleanTagOrImage($content, array $tags) {
      // RICH TEXT : delete img tag
      $content = Html::entity_decode_deep($content);

      foreach ($tags as $tag) {
         $content = preg_replace("/]*\>/", "
", $content);
      }

      return $content;
   }

   /**
    * Decode JSON in GLPI
    * Because json can have been modified from addslashes_deep
    *
    * @param string $encoded Encoded JSON
    * @param boolean $assoc  assoc parameter of json_encode native function
    *
    * @return mixed
    */
   static public function jsonDecode($encoded, $assoc = false) {
      if (!is_string($encoded)) {
         self::log(null, Logger::NOTICE, ['Only strings can be json to decode!']);
         return $encoded;
      }

      $json = json_decode($encoded, $assoc);

      if (json_last_error() != JSON_ERROR_NONE) {
         //something went wrong... Try to stripslashes before decoding.
         $json = json_decode(self::stripslashes_deep($encoded), $assoc);
         if (json_last_error() != JSON_ERROR_NONE) {
            self::log(null, Logger::NOTICE, ['Unable to decode JSON string! Is this really JSON?']);
            return $encoded;
         }
      }

      return $json;
   }

   /**
    * Checks if a string starts with another one
    *
    * @since 9.1.5
    *
    * @param string $haystack String to check
    * @param string $needle   String to find
    *
    * @return boolean
    */
   static public function startsWith($haystack, $needle) {
      $length = strlen($needle);
      return (substr($haystack, 0, $length) === $needle);
   }

   /**
    * Checks if a string starts with another one
    *
    * @since 9.2
    *
    * @param string $haystack String to check
    * @param string $needle   String to find
    *
    * @return boolean
    */
   static public function endsWith($haystack, $needle) {
      $length = strlen($needle);
      return $length === 0 || (substr($haystack, -$length) === $needle);
   }

   /**
    * gets the IP address of the client
    *
    * @since 9.2
    *
    * @return string the IP address
    */
   public static function getRemoteIpAddress() {
      return (isset($_SERVER["HTTP_X_FORWARDED_FOR"]) ?
         self::clean_cross_side_scripting_deep($_SERVER["HTTP_X_FORWARDED_FOR"]):
         $_SERVER["REMOTE_ADDR"]);
   }

   /**
    * Get available date formats
    *
    * @since 9.2
    *
    * @param string $type Type for (either 'php' or 'js')
    *
    * @return array
    */
   public static function getDateFormats($type) {
      $formats = [];
      switch ($type) {
         case 'js':
            $formats = [
               0 => 'Y-m-d',
               1 => 'd-m-Y',
               2 => 'm-d-Y'
            ];
            break;
         case 'php':
            $formats = [
               0 => __('YYYY-MM-DD'),
               1 => __('DD-MM-YYYY'),
               2 => __('MM-DD-YYYY')
            ];
            break;
         default:
            throw new \RuntimeException("Unknown type $type to get date formats.");
      }
      return $formats;
   }

   /**
    * Get current date format
    *
    * @since 9.2
    *
    * @param string $type Type for (either 'php' or 'js')
    *
    * @return string
    */
   public static function getDateFormat($type) {
      $formats = self::getDateFormats($type);
      $format = $formats[$_SESSION["glpidate_format"]];
      return $format;
   }

   /**
    * Get current date format for php
    *
    * @since 9.2
    *
    * @return string
    */
   public static function phpDateFormat() {
      return self::getDateFormat('php');
   }

   /**
    * Get available date formats for php
    *
    * @since 9.2
    *
    * @return array
    */
   public static function phpDateFormats() {
      return self::getDateFormats('php');
   }

   /**
    * Get current date format for javascript
    *
    * @since 9.2
    *
    * @return string
    */
   public static function jsDateFormat() {
      return self::getDateFormat('js');
   }

   /**
    * Get available date formats for javascript
    *
    * @since 9.2
    *
    * @return array
    */
   public static function jsDateFormats() {
      return self::getDateFormats('js');
   }

   /**
    * Format a web link adding http:// if missing
    *
    * @param string $link link to format
    *
    * @return string formatted link.
    **/
   public static function formatOutputWebLink($link) {
      if (!preg_match("/^https?/", $link)) {
         return "http://".$link;
      }
      return $link;
   }

   /**
    * Should cache be used
    *
    * @since 9.2
    *
    * @return boolean
    */
   public static function useCache() {
      global $GLPI_CACHE;
      return $GLPI_CACHE != null
         && (!defined('TU_USER') || defined('CACHED_TESTS'));
   }

   /**
    * Convert a integer index into an excel like alpha index (A, B, ..., AA, AB, ...)
    * @since 9.3
    * @param  integer $index the numeric index
    * @return string         excel like string index
    */
   public static function getBijectiveIndex($index = 0) {
      $bij_str = "";
      while ((int) $index > 0) {
         $index--;
         $bij_str = chr($index%26 + ord("A")) . $bij_str;
         $index /= 26;
      }
      return $bij_str;
   }

   /**
    * Get HTML content to display (cleaned)
    *
    * @since 9.1.8
    *
    * @param string $content Content to display
    *
    * @return string
    */
   public static function getHtmlToDisplay($content) {
      $content = Toolbox::unclean_cross_side_scripting_deep(
         Html::entity_decode_deep(
            $content
         )
      );
      $content = nl2br(Html::clean($content, false, 1));
      return $content;
   }

   /**
    * Save a picture and return destination filepath.
    * /!\ This method is made to handle uploaded files and removes the source file filesystem.
    *
    * @param string|null $src          Source path of the picture
    * @param string      $uniq_prefix  Unique prefix that can be used to improve uniqueness of destination filename
    *
    * @return boolean|string      Destination filepath, relative to GLPI_PICTURE_DIR, or false on failure
    *
    * @since 9.5.0
    */
   static public function savePicture($src, $uniq_prefix = null) {

      if (!Document::isImage($src)) {
         return false;
      }

      $filename     = uniqid($uniq_prefix);
      $ext          = pathinfo($src, PATHINFO_EXTENSION);
      $subdirectory = substr($filename, -2); // subdirectory based on last 2 hex digit

      $i = 0;
      do {
         // Iterate on possible suffix while dest exists.
         // This case will almost never exists as dest is based on an unique id.
         $dest = GLPI_PICTURE_DIR
            . '/' . $subdirectory
            . '/' . $filename . ($i > 0 ? '_' . $i : '') . '.' . $ext;
         $i++;
      } while (file_exists($dest));

      if (!is_dir(GLPI_PICTURE_DIR . '/' . $subdirectory) && !mkdir(GLPI_PICTURE_DIR . '/' . $subdirectory)) {
         return false;
      }

      if (!rename($src, $dest)) {
         return false;
      }

      return substr($dest, strlen(GLPI_PICTURE_DIR . '/')); // Return dest relative to GLPI_PICTURE_DIR
   }


   /**
    * Delete a picture.
    *
    * @param string $path
    *
    * @return boolean
    *
    * @since 9.5.0
    */
   static function deletePicture($path) {

      $fullpath = GLPI_PICTURE_DIR . '/' . $path;

      if (!file_exists($fullpath)) {
         return false;
      }

      $fullpath = realpath($fullpath);
      if (!Toolbox::startsWith($fullpath, realpath(GLPI_PICTURE_DIR))) {
         // Prevent deletion of a file ouside pictures directory
         return false;
      }

      return @unlink($fullpath);
   }


   /**
    * Get picture URL.
    *
    * @param string $path
    *
    * @return null|string
    *
    * @since 9.5.0
    */
   static function getPictureUrl($path) {
      global $CFG_GLPI;

      $path = Html::cleanInputText($path); // prevent xss

      if (empty($path)) {
         return null;
      }

      return $CFG_GLPI["root_doc"] . '/front/document.send.php?file=_pictures/' . $path;
   }

   /**
    * Send the given HTTP code then die with the error message in the given format
    *
    * @param int     $code    HTTP code to set for the response
    * @param string  $message Error message to display
    * @param string  $format  Output format (json or string)
    */
   public static function throwError(
      int $code,
      string $message,
      string $format = "json"
   ) {
      switch ($format) {
         case 'json':
            $output = json_encode(["message" => $message]);
            break;

         case 'string':
         default:
            $output = $message;
            break;
      }

      http_response_code($code);
      Toolbox::logWarning($message);
      die($output);
   }

   /**
    * Return a shortened number with a suffix (K, M, B, T)
    *
    * @param int $number to shorten
    * @param int $precision how much number after comma we need
    * @param bool $html do we return an html or a single string
    *
    * @return string shortened number
    */
   static function shortenNumber($number = 0, $precision = 1, bool $html = true): string {
      $suffix = "";
      if ($number < 900) {
         $formatted = number_format($number);
      } else if ($number < 900000) {
         $formatted = number_format($number / 1000, $precision);
         $suffix = "K";
      } else if ($number < 900000000) {
         $formatted = number_format($number / 1000000, $precision);
         $suffix = "M";
      } else if ($number < 900000000000) {
         $formatted = number_format($number / 1000000000, $precision);
         $suffix = "B";
      } else {
         $formatted = number_format($number / 1000000000000, $precision);
         $suffix = "T";
      }

      if (strpos($formatted, '.') === false) {
         $precision = 0;
      }

      if ($html) {
         $formatted = <<
               $formatted
               $suffix
            
HTML;
      } else {
         $formatted .= $suffix;
      }

      return $formatted;
   }


   /**
    * Get a fixed hex color for a input string
    * Inpsired by shahonseven/php-color-hash
    * @since 9.5
    *
    * @param string $str
    *
    * @return string hex color (ex #FAFAFA)
    */
   static function getColorForString(string $str = ""):string {
      $seed  = 131;
      $seed2 = 137;
      $hash  = 0;
      // Make hash more sensitive for short string like 'a', 'b', 'c'
      $str .= 'x';
      $max = intval(9007199254740991 / $seed2);

      // Backport of Javascript function charCodeAt()
      $getCharCode = function($c) {
         list(, $ord) = unpack('N', mb_convert_encoding($c, 'UCS-4BE', 'UTF-8'));
         return $ord;
      };

      // generate integer hash
      for ($i = 0, $ilen = mb_strlen($str, 'UTF-8'); $i < $ilen; $i++) {
         if ($hash > $max) {
            $hash = intval($hash / $seed2);
         }
         $hash = $hash * $seed + $getCharCode(mb_substr($str, $i, 1, 'UTF-8'));
      }

      //get Hsl
      $base_L = $base_S = [0.35, 0.5, 0.65];
      $H = $hash % 359;
      $hash = intval($hash / 360);
      $S = $base_S[$hash % count($base_S)];
      $hash = intval($hash / count($base_S));
      $L = $base_L[$hash % count($base_L)];
      $hsl = [
         'H' => $H,
         'S' => $S,
         'L' => $L
      ];

      // return hex
      return "#".Color::hslToHex($hsl);
   }


   /**
    * Return a frontground color for a given background color
    * if bg color is light, we'll return dark fg color
    * else a light fg color
    *
    * @param string $color the background color in hexadecimal notation (ex #FFFFFF) to compute
    * @param int $offset how much we need to darken/lighten the color
    *
    * @return string hexadecimal fg color (ex #FFFFFF)
    */
   static function getFgColor(string $color = "", int $offset = 40): string {
      $fg_color = "FFFFFF";
      if ($color !== "") {
         $color_inst = new Color($color);

         // adapt luminance part
         if ($color_inst->isLight()) {
            $hsl = Color::hexToHsl($color);
            $hsl['L'] = max(0, $hsl['L'] - ($offset / 100));
            $fg_color = Color::hslToHex($hsl);
         } else {
            $hsl = Color::hexToHsl($color);
            $hsl['L'] = min(1, $hsl['L'] + ($offset / 100));
            $fg_color = Color::hslToHex($hsl);
         }
      }

      return "#".$fg_color;
   }

   /**
    * Get an HTTP header value
    *
    * @since 9.5
    *
    * @param string $name
    *
    * @return mixed The header value or null if not found
    */
   public static function getHeader(string $name) {
      // Format expected header name
      $name = "HTTP_" . str_replace("-", "_", strtoupper($name));

      return $_SERVER[$name] ?? null;
   }

   /**
    * Check if the given class exist and extends CommonDBTM
    *
    * @param string $class
    * @return bool
    */
   public static function isCommonDBTM(string $class): bool {
      return class_exists($class) && is_subclass_of($class, 'CommonDBTM');
   }

   /**
    * Check if the given class exist and implement DeprecatedInterface
    *
    * @param string $class
    * @return bool
    */
   public static function isAPIDeprecated(string $class): bool {
      $deprecated = "Glpi\Api\Deprecated\DeprecatedInterface";

      // Insert namespace if missing
      if (strpos($class, "Glpi\Api\Deprecated") === false) {
         $class = "Glpi\Api\Deprecated\\$class";
      }

      return class_exists($class) && is_a($class, $deprecated, true);
   }

   /**
    * Check URL validity
    *
    * @param string $url The URL to check
    *
    * @return boolean
    */
   public static function isValidWebUrl($url): bool {
      // Verify absence of known disallowed characters.
      // It is still possible to have false positives, but a fireproof check would be too complex
      // (or would require usage of a dedicated lib).
      return (preg_match(
         "/^(?:http[s]?:\/\/(?:[^\s`!()\[\]{};'\",<>?«»“”‘’+]+|[^\s`!()\[\]{};:'\".,<>?«»“”‘’+]))$/iu",
         $url
      ) === 1);
   }
}