PHP: 运行时配置

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
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 ¶

4 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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