这些函数的行为受 php.ini 的影响。
| 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. |
有关 PHP_INI_* 常量进一步的细节与定义参见php.ini 配置选项。
以下是配置选项的简要解释。
PCRE's backtracking limit.
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).