(PHP 5 >= 5.2.0, PHP 7)
preg_last_error — �������һ��PCRE����ִ�в����Ĵ������
�������һ��PCRE����ִ�еĴ�����롣
Example #1 preg_last_error() ʾ��
<?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!
�������泣���е�һ��(�鿴��������Ľ���):
PREG_NO_ERROR
PREG_INTERNAL_ERROR
PREG_BACKTRACK_LIMIT_ERROR
���μ� pcre.backtrack_limit��PREG_RECURSION_LIMIT_ERROR
���μ� pcre.recursion_limit��PREG_BAD_UTF8_ERROR
PREG_BAD_UTF8_OFFSET_ERROR
���� PHP 5.3.0 ��PREG_JIT_STACKLIMIT_ERROR
(�� PHP 7.0.0 ��)