模板引擎正则表达式调试小技巧_PHP教程

if (is_null($tmp)){
$error_code = preg_last_error();
switch($error_code){
case PREG_NO_ERROR :
echo 'PREG_NO_ERROR';
break;
case PREG_INTERNAL_ERROR:
echo 'PREG_INTERNAL_ERROR';
break;
case PREG_BACKTRACK_LIMIT_ERROR:
echo 'PREG_BACKTRACK_LIMIT_ERROR';
break;
case PREG_RECURSION_LIMIT_ERROR:
echo 'PREG_RECURSION_LIMIT_ERROR';
break;
case PREG_BAD_UTF8_ERROR:
echo 'PREG_BAD_UTF8_ERROR';
break;
case PREG_BAD_UTF8_OFFSET_ERROR:
echo 'PREG_BAD_UTF8_OFFSET_ERROR';
break;
default:
echo 'UNKNOW ERROR';
}
exit;
}