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PHP srand

PHP original manual for srand [ show | php.net ]

srand

(PHP 4, PHP 5, PHP 7)

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() - Generate a random integer
  • getrandmax() - Show largest possible random value
  • mt_srand() - Seeds the Mersenne Twister Random Number Generator