preg_last_error

(PHP 5 >= 5.2.0, PHP 7)

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preg_last_error ( void ) : int

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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 ��)