static function rotateLog($fileName)
 {
     $maxLogrotateFiles = eZLog::maxLogrotateFiles();
     if ($maxLogrotateFiles == 0) {
         return;
     }
     for ($i = $maxLogrotateFiles; $i > 0; --$i) {
         $logRotateName = $fileName . '.' . $i;
         if (file_exists($logRotateName)) {
             if ($i == $maxLogrotateFiles) {
                 @unlink($logRotateName);
             } else {
                 $newLogRotateName = $fileName . '.' . ($i + 1);
                 eZFile::rename($logRotateName, $newLogRotateName);
             }
         }
     }
     if (file_exists($fileName)) {
         $newLogRotateName = $fileName . '.' . 1;
         eZFile::rename($fileName, $newLogRotateName);
         return true;
     }
     return false;
 }