이 함수의 작동은 php.ini 설정에 영향을 받습니다.
위 설정 지시어에 대한 간단한 설명입니다.
pcre.backtrack_limit
PCRE's backtracking limit. Defaults to 100000 for PHP < 5.3.7.
pcre.recursion_limit
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
Whether PCRE's just-in-time compilation is going to be used.