PHP mt_srand() 函数

随机数生成器的种子：

<?php
mt_srand(mktime());
echo(mt_rand());
?>

定义和用法

mt_srand() 函数为 Mersenne Twister 随机数生成器提供种子。

mt_srand( seed, mode);

Parameter	Description
seed	Optional. Specifies the seed value
mode	Optional. Specifies the algorithm to use. Can be one of the following constants: MT_RAND_MT19937 - uses the fixed, correct Mersenne Twister implementation (which is used from PHP 7.1) MT_RAND_PHP - uses the incorrect Mersenne Twister implementation (which was used up to PHP 7.1)