code: function check_level($error_level, $errno, $message)
  	{
  		if (error_reporting() & $error_level) {
  			switch ($error_level) {
  				case E_NOTICE:  $type = 'notice';  break;
  				case E_WARNING: $type = 'warning'; break;
  				case E_ERROR:   $type = 'error';   break;
  			}
  			echo "<b>ETS $type:</b> $message";
  		}
  		if ($error_level == E_ERROR) {
  			exit;
  		}
  	}
docs: Check PHP error level