/**
  * Создаем папку
  * @param $dir
  */
 public static function mkdir($dir)
 {
     if (!file_exists($dir)) {
         @mkdir($dir, 0755);
         if (!is_dir($dir)) {
             self::$error = str_replace("&s", $dir, langWPADM::get('Failed to create a file, please check the permissions on the folders "&s".', false));
         } else {
             //todo: права доступа
             @file_put_contents($dir . '/index.php', '<?php echo "Hello World!"; ');
             if (!is_writable($dir . '/index.php')) {
                 self::$error = str_replace("&s", $dir, langWPADM::get('Failed to create a file, please check the permissions on the folders "&s".', false));
             }
         }
     }
     return self::$error;
 }