srand

(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.

Príklad 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();
?>

Poznámka: Po��naj�c PHP 4.2.0 nie je potrebn� �tartova� gener�tor n�hodn�ch ��sel s srand() alebo mt_srand(), nako�ko sa tak u�in� automaticky.

See also: rand(), getrandmax(), and mt_srand().