function write($string, $verbosityLevel = self::LEVEL_NOTICE, $label = "", $backgroundClass = "", $alwaysLog = false)
 {
     $enabled = eZDebug::isDebugEnabled();
     if (!$alwaysLog and !$enabled) {
         return;
     }
     switch ($verbosityLevel) {
         case self::LEVEL_NOTICE:
         case self::LEVEL_WARNING:
         case self::LEVEL_ERROR:
         case self::LEVEL_DEBUG:
         case self::LEVEL_TIMING_POINT:
         case self::LEVEL_STRICT:
             break;
         default:
             $verbosityLevel = self::LEVEL_ERROR;
             break;
     }
     if ($this->MessageOutput & self::OUTPUT_MESSAGE_SCREEN and $enabled) {
         print "{$verbosityLevel}: {$string} ({$label})\n";
     }
     $files = $this->logFiles();
     $fileName = false;
     if (isset($files[$verbosityLevel])) {
         $fileName = $files[$verbosityLevel];
     }
     if ($this->MessageOutput & self::OUTPUT_MESSAGE_STORE or $alwaysLog) {
         if (!eZDebug::isLogOnlyEnabled() and $enabled) {
             $ip = eZSys::clientIP();
             if (!$ip) {
                 $ip = eZSys::serverVariable('HOSTNAME', true);
             }
             $this->DebugStrings[] = array("Level" => $verbosityLevel, "IP" => $ip, "Time" => time(), "Label" => $label, "String" => $string, "BackgroundClass" => $backgroundClass);
         }
         if ($fileName !== false) {
             $timePoints = $this->TmpTimePoints[$verbosityLevel];
             if (is_array($timePoints)) {
                 if ($this->isLogFileEnabled($verbosityLevel)) {
                     foreach ($timePoints as $tp) {
                         $desc = "Timing Point: " . $tp["Description"];
                         $this->writeFile($fileName, $desc, $verbosityLevel, $alwaysLog);
                     }
                 }
                 $this->TmpTimePoints[$verbosityLevel] = false;
             }
             if ($this->isLogFileEnabled($verbosityLevel)) {
                 $string = "{$label}:\n{$string}";
                 $this->writeFile($fileName, $string, $verbosityLevel, $alwaysLog);
             }
         }
     }
 }