The string length problem of preg_match function regular matching in PHP _php tutorial

The string length problem of regular matching of preg_match function in PHP

This article mainly introduces PHP Preg_match function Regular matching string length problem, if you also encountered Preg_match regular extract content is always blank or not extracted, it may be encountered this problem, the need for friends can refer to the next

Project, using Preg_match to extract the target content, dead and alive there is a problem, the code measured very much.

Later suspected that PHP Preg_match has a string length limit, sure enough, found that the value of "Pcre.backtrack_limit" is set by default only 100000.

Workaround: Ini_set (' Pcre.backtrack_limit ', 999999999);

Note: This parameter is available after PHP 5.2.0 version.

Also talk about: Pcre.recursion_limit

Pcre.recursion_limit is the recursive limit of pcre, which, if set to a large value, consumes the available stacks of all processes and eventually causes PHP to crash.

can also be limited by modifying the configuration: Ini_set (' Pcre.recursion_limit ', 99999);

In the actual project application, it is best to also set the memory limit: Ini_set (' memory_limit ', ' 64M '); , so it's more secure.

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