运行时配置

这些函数的行为受 php.ini 中的设置影响。

PCRE配置选项
名字 默认 可修改范围 更新日志
pcre.backtrack_limit "100000" INI_ALL  
pcre.recursion_limit "100000" INI_ALL  
pcre.jit "1" INI_ALL  
有关 INI_* 样式的更多详情与定义,见 配置可被设定范围

这是配置指令的简短说明。

pcre.backtrack_limit int

PCRE的回溯限制.

pcre.recursion_limit int

PCRE 的递归限制. 请注意, 如果将这个值设置为一个很大的数字, 可能会消耗掉进程所有可用的堆栈, 最终导致 PHP 崩溃(由于达到操作系统限制的堆栈大小)。

pcre.jit bool

是否使用 PCRE 的 JIT 编译。

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User Contributed Notes 2 notes

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-6
chris at ocproducts dot com
14 years ago
pcre.backtrack_limit sets the maximum bind length PREG calls (e.g. preg_replace_callback) can make. However the actual maximum seems to be approximately half the value set here, possibly due to the character encoding that PCRE runs with internally.
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-15
610010559 at qq dot com
5 years ago
pcre.backtrack_limit can be set to -1;
ini_set("pcre.backtrack_limit", "-1");

after i put the above code in my code, it works;
so i guess -1 means infinite(i am not very sure ,but it works);
so when you have not idea how much it should be set in your program, you can try this.
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