PHP mt_srand() Function

Seed the random number generator:

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

Definition and Usage

The mt_srand() function seeds the Mersenne Twister random number generator.

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)

Return Value:	None
Return Type:	-
PHP Version:	4+
PHP Changelog:	PHP 4.2.0: Random number generator is now seeded automatically