preg_last_error
(PHP 5 >= 5.2.0)
preg_last_error — 返回最后一个PCRE正则执行产生的错误代码
说明
int preg_last_error ( void )返回最后一次PCRE正则执行的错误代码.
Example #1 preg_last_error() 示例 以上例程会输出:
<?php
preg_match('/(?:D+|<d+>)*[!?]/', 'foobar foobar foobar');
if (preg_last_error() == PREG_BACKTRACK_LIMIT_ERROR) {
print 'Backtrack limit was exhausted!';
}
?>
Backtrack limit was exhausted!
返回值
返回下面常量中的一个(查看它们自身的解释):
- PREG_NO_ERROR
- PREG_INTERNAL_ERROR
- PREG_BACKTRACK_LIMIT_ERROR (see also pcre.backtrack_limit)
- PREG_RECURSION_LIMIT_ERROR (see also pcre.recursion_limit)
- PREG_BAD_UTF8_ERROR
- PREG_BAD_UTF8_OFFSET_ERROR (since PHP 5.3.0)