mt_srand

Function • Params changed in PHP 8.3

Seeds the Mersenne Twister Random Number Generator.

PHP 5

PHP 7

Improved

Improved

Changed

Improved

PHP 8.4

PHP 8.5

PHP 8.6

mt_srand(?int $seed = null, int $mode = MT_RAND_MT19937): void

OptionalType?intDefault valuenull

Fills the state with values generated with a linear congruential generator that was seeded with $seed interpreted as an unsigned 32 bit integer.

OptionalTypeintDefault valueMT_RAND_MT19937

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

$mode accepts one of the following constant values:

The mt_srand function is a void function; it does not return any values.

Changes to the `mt_srand` Function

Parameter type changed for parameter #1 ($seed): int to ?int
Parameter default value changed for position #1 ($seed): <default> to null

- mt_srand(int $seed = <default>, int $mode = MT_RAND_MT19937): void
+ mt_srand(?int $seed = null, int $mode = MT_RAND_MT19937): void

Parameter default value changed for position #1 ($seed): 0 to <default>

- mt_srand(int $seed = 0, int $mode = MT_RAND_MT19937): void
+ mt_srand(int $seed = <default>, int $mode = MT_RAND_MT19937): void

- mt_srand($seed, $mode)
+ mt_srand(int $seed = 0, int $mode = MT_RAND_MT19937): void

- mt_srand($seed)
+ mt_srand($seed, $mode)