srand

Seed the random number generator

Description

void srand ([ int $seed ] )

Seeds the random number generator with seed or with a random value if no seed is given.

Note: There is no need to seed the random number generator with srand or mt_srand as this is done automatically.

Note: As of PHP 7.1.0, srand has been made an alias of mt_srand.

Parameters

seed: An arbitrary integer seed value.

Return Values

No value is returned.

Changelog

Version	Description
7.1.0	srand has been made an alias of mt_srand.

Examples

Example #1 srand example


<?php
// seed with microseconds
function make_seed()
{
  list($usec, $sec) = explode(' ', microtime());
  return $sec + $usec * 1000000;
}
srand(make_seed());
$randval = rand();
?>

See Also

rand
getrandmax
mt_srand