The upper-bound of this value is platform-independent. PHP implements the 32-bit version of the Mersenne Twister ("mt"), so the maximum possible value is 2**31 - 1 (2147483647).
(PHP 4, PHP 5, PHP 7)
mt_getrandmax — 가능한 최대 난수 값을 표시
mt_rand()가 반환하는 최대 난수값을 반환합니다.
The upper-bound of this value is platform-independent. PHP implements the 32-bit version of the Mersenne Twister ("mt"), so the maximum possible value is 2**31 - 1 (2147483647).