Runtime Configuration

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

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).

pcre.jit
boolean

Whether PCRE’s just-in-time compilation is going to
be used.