PHP: 執行時期設定

執行時期設定

這些函式的行為受 php.ini 的影響。

**PCRE Configuration Options**
名字	預設	可修改範圍	更新日誌
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.

有關 PHP_INI_* 常數進一步的細節與定義參見Where a configuration setting may be set。

以下是設定選項的簡要解釋。

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).

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User Contributed Notes 2 notes

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-6

chris at ocproducts dot com ¶

13 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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