Php/docs/function.gmp-random-seed
gmp_random_seed
(PHP 7)
gmp_random_seed — Sets 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
- gmp_init() - Create GMP number
- gmp_random() - Random number
- gmp_random_bits() - Random number
- gmp_random_range() - Random number