Runtime Configuration

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

PCRE Configuration Options
Name Default Changeable Changelog
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.
For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

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).

Коментарии

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.
2010-07-02 10:42:48
http://php5.kiev.ua/manual/ru/pcre.configuration.html
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.
2019-11-18 14:05:11
http://php5.kiev.ua/manual/ru/pcre.configuration.html

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