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PHP Manual

## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

PCRE Configuration Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
pcre.backtrack_limit | "100000" | PHP_INI_ALL | Available since PHP 5.2.0.
pcre.recursion_limit | "100000" | PHP_INI_ALL | Available since PHP 5.2.0.

For further details and definitions of the PHP_INI_* constants, see the php.ini directives.

Here's a short explanation of the configuration directives.

`pcre.backtrack_limit` integer

  PCRE's backtracking limit.

`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).

Installation
Resource Types
Installing/Configuring
PHP Manual