preg_last_error

(PHP 5 >= 5.2.0)

preg_last_error — Returns the error code of the last PCRE regex execution

说明

int preg_last_error ( void )

Returns the error code of the last PCRE regex execution.

Example #1 preg_last_error() example


<?php

preg_match('/(?:\D+|<\d+>)*[!?]/', 'foobar foobar foobar');

if (preg_last_error() == PREG_BACKTRACK_LIMIT_ERROR) {
    print 'Backtrack limit was exhausted!';
}

?>

上例将输出：

Backtrack limit was exhausted!

返回值

Returns one of the following constants (explained on their own page):

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)