mt_srand

(PHP 4, PHP 5, PHP 7)

mt_srandSeeds the Mersenne Twister Random Number Generator

Açıklama

mt_srand ([ int $seed [, int $mode = MT_RAND_MT19937 ]] ) : void

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

Bilginize: Özdevinimli olarak yapıldığından srand() veya mt_srand() işleviyle rasgele sayı üretecini tohumlamaya ihtiyaç yoktur.

Değiştirgeler

seed

An arbitrary integer seed value.

mode

Use one of the following constants to specify the implementation of the algorithm to use.

Constant Açıklama
MT_RAND_MT19937 Uses the fixed, correct, Mersenne Twister implementation, available as of PHP 7.1.0.
MT_RAND_PHP Uses an incorrect Mersenne Twister implementation which was used as the default up till PHP 7.1.0. This mode is available for backward compatibility.

Dönen Değerler

Hiçbir değer dönmez.

Sürüm Bilgisi

Sürüm: Açıklama
7.1.0 srand() has been made an alias of mt_srand().
7.1.0 mt_rand() has been updated to use the fixed, correct, version of the Mersenne Twister algorithm. To fall back to the old behaviour, use mt_srand() with MT_RAND_PHP as the second parameter.
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.

Örnekler

Örnek 1 mt_srand() example

<?php
// seed with microseconds
function make_seed()
{
  list(
$usec$sec) = explode(' 'microtime());
  return 
$sec $usec 1000000;
}
mt_srand(make_seed());
$randval mt_rand();
?>

Ayrıca Bakınız

  • mt_rand() - Generate a random value via the Mersenne Twister Random Number Generator
  • mt_getrandmax() - Show largest possible random value
  • srand() - Seed the random number generator