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# mt_srand

(PHP 3 >= 3.0.6, PHP 4, PHP 5)

mt_srand -- Seed the better random number generator

## Description

void mt_srand ( [int seed] )

Seeds the random number generator with seed. Since PHP 4.2.0, the seed becomes optional and defaults to a random value if omitted.

範例 1. mt_srand() example

`<?php // seed with microseconds function make_seed() { list($usec, $sec) = explode(' ', microtime()); return (float) $sec + ((float) $usec * 100000); } mt_srand(make_seed()); $randval = mt_rand(); ?>`

> 注: ��PHP 4.2.0 �l�A�z�ݭn�A�ϥ� srand() �� mt_srand() �üƲ�;�Ѻؤl�A�]�o�w�۰ʪ�ѤF�C

See also: mt_rand(), mt_getrandmax(), and srand().

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