gmp_random_seed

    (PHP 7, PHP 8)

    gmp_random_seed — Sets the RNG seed

    说明

    gmp_random_seed(GMP|int|string $seed): void

    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

    没有返回值。

    错误／异常

    Throws a ValueError if seed is invalid.

    更新日志

    版本 说明
    8.0.0 If seed is invalid, gmp_random_seed() now throws a ValueError. Previously it emitted an E_WARNING and returned false.

    示例

    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'));

    以上示例会输出：

    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)

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