public function __construct($code, $message, $file, $line, $previous = null)
 {
     $this->_file = $file;
     $this->_line = $line;
     if (version_compare(PHP_VERSION, '5.3.0', '>=')) {
         parent::__construct($message, $code, $previous);
     } else {
         parent::__construct($message, $code);
     }
 }