PHP srand() Function

Seed the random number generator:

<?php
srand(mktime());
echo(rand());
?>

Definition and Usage

The srand() function seeds the random number generator (rand()).

Tip: From PHP 4.2.0, the random number generator is seeded automatically and there is no need to use this function.

srand(seed);

Parameter	Description
seed	Optional. Specifies the seed value

Return Value:	None
Return Type:	-
PHP Version:	4+
PHP Changelog:	PHP 7.1.0: srand() has been an alias of mt_srand(). PHP 4.2.0: Random number generator is now seeded automatically.