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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
| Sr.No | Parameter & Description |
|---|---|
| 1 | seed an integer to be used as seed. If not given, a random number is given |
| 2 | mode Use one of the following constants to specify mode of implementation MT_RAND_MT19937 uses fixed Mersenne Twister implementation MT_RAND_PHP uses default implementation |
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
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
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
Updated on: 30-Jun-2020
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