The behaviour of these functions is affected by settings in php.ini.
Name | Default | Changeable | Changelog |
---|---|---|---|
pcre.backtrack_limit | "1000000" | PHP_INI_ALL | Available since PHP 5.2.0. |
pcre.recursion_limit | "100000" | PHP_INI_ALL | Available since PHP 5.2.0. |
Here's a short explanation of the configuration directives.
pcre.backtrack_limit
integer
PCRE's backtracking limit. Defaults to 100000 for PHP < 5.3.7.
pcre.recursion_limit
integer
PCRE's recursion limit. Please note that if you set this value to a high number you may consume all the available process stack and eventually crash PHP (due to reaching the stack size limit imposed by the Operating System).