PHP - Manual: gmp_random_seed
2024-11-24
(PHP 7, PHP 8)
gmp_random_seed — Sets the RNG seed
seed
The seed to be set for the gmp_random(), gmp_random_bits(), and gmp_random_range() functions.
GMP 对象或 int ,或数字string。
成功时返回 null
, 或者在失败时返回 false
。
Issues an E_WARNING
and returns false
if
seed
is not valid.
示例 #1 gmp_random_seed() example
<?php
// set the seed
gmp_random_seed(100);
var_dump(gmp_strval(gmp_random(1)));
// set the seed to something else
gmp_random_seed(gmp_init(-100));
var_dump(gmp_strval(gmp_random_bits(10)));
// set the seed to something invalid
var_dump(gmp_random_seed('not a number'));
以上例程会输出:
string(20) "15370156633245019617" string(3) "683" Warning: gmp_random_seed(): Unable to convert variable to GMP - string is not an integer in %s on line %d bool(false)
官方地址:https://www.php.net/manual/en/function.gmp-random-seed.php