Php/docs/function.gmp-random-seed

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gmp_random_seed

(PHP 7)

gmp_random_seedSets the RNG seed


Description

gmp_random_seed ( mixed $seed ) : void

Parameters

seed

The seed to be set for the gmp_random(), gmp_random_bits(), and gmp_random_range() functions.

Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.


Return Values

Returns NULL on success or FALSE on failure.


Errors/Exceptions

Issues an E_WARNING and returns FALSE if seed is not valid.


Examples

Example #1 gmp_random_seed() example

<?php// set the seedgmp_random_seed(100);var_dump(gmp_strval(gmp_random(1)));// set the seed to something elsegmp_random_seed(gmp_init(-100));var_dump(gmp_strval(gmp_random_bits(10)));// set the seed to something invalidvar_dump(gmp_random_seed('not a number'));

The above example will output:


string(20) "15370156633245019617"
string(3) "683"

Warning: gmp_random_seed(): Unable to convert variable to GMP - string is not an integer in %s on line %d
bool(false)

See Also