PHP mt_srand() Function

Definition and Usage

Prefix 'mt' in function's name stands for Mersenne Twister. The mt_srand() function is used to seed the Mersenne Twister random number generaror. Seeding initializes the random number generator. Most random number generators need initial seeding. In PHP, use of mt_srand() function is optional as it is done automatically.

This function doen't have any return value.

Syntax

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

Parameters

Return Values

This function doesn't return any value.

PHP Version

This function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.

Example

 Live Demo

This example the random number generator is first initialized before employing rand() function−

<?php
   mt_srand(5);
   echo "mt_rand(1,100)=", mt_rand(1,100);
?>

Output

This may produce following result −

mt_rand(1,100)=12

Example

 Live Demo

Following example uses current timestamp to initialize random number generator−

<?php
   mt_srand(time());
   echo "mt_rand()=", mt_rand();
?>

Output

This may produce following result−

mt_rand()=548287992