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PHP mt_srand() Function

Complete PHP Math Reference

Definition and Usage

The mt_srand() function seeds the random number generator for mt_rand().

This function should be called only once per script, and it must be called before any calls to mt_rand().

Syntax

mt_srand(seed)

Parameter	Description
seed	Optional. Seed number for the random number generator. If omitted, a random value is used.

Tips and Notes

Note: In PHP 4.2.0 and later, there is no need to seed the random generator with mt_srand(). This is done automatically.

Tip: The greater the randomness of the seed, the more random number you'll get. A suitable number to seed this function with, is mktime().

Example

In this example we will seed the random number generator:

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

The output of the code above could be:

1132656473