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.
Comportamentul acestor funcții este afectat de parametrii stabiliți în php.ini.
Denumire | Valoare implicită | Poate fi modificată | Jurnal al modificărilor |
---|---|---|---|
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. |
pcre.jit | "1" | PHP_INI_ALL | Available since PHP 7.0.0. |
Iată o explicație pe scurt a directivelor de configurare.
pcre.backtrack_limit
int
PCRE's backtracking limit. Defaults to 100000 for PHP < 5.3.7.
pcre.recursion_limit
int
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).
pcre.jit
bool
Whether PCRE's just-in-time compilation is going to be used.
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.
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.