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(PHP 3, PHP 4, PHP 5)

srand -- Seed the random number generator

Description

void 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.

Example 1. srand() example

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

Related Function(s)

mt_srand()

rand()

getrandmax()