gmp_random_seed
(PHP 7, PHP 8)
gmp_random_seed — Sets the RNG seed
说明
参数
-
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。
返回值
成功时返回 null
, 或者在失败时返回 false
。
错误/异常
Issues an E_WARNING
and returns false
if
seed
is not valid.
范例
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)
参见
- gmp_init() - Create GMP number
- gmp_random() - Random number
- gmp_random_bits() - Random number
- gmp_random_range() - Random number
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