PYTHON mt_srand

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PHP mt_srand

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

mt_srand

(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 or with a random value if no seed is given.

Note: As of PHP 4.2.0, there is no need to seed the random number generator with srand() or mt_srand() as this is now done automatically.

Parameters

seed

An optional seed value

Changelog

Version Description
Since 4.2.0 The seed becomes optional and defaults to a random value if omitted.
Since 5.2.1 The Mersenne Twister implementation in PHP now uses a new seeding algorithm by Richard Wagner. Identical seeds no longer produce the same sequence of values they did in previous versions. This behavior is not expected to change again, but it is considered unsafe to rely upon it nonetheless.

Examples

Example #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();
?>

See Also

Math Functions
PHP Manual