(PHP 7)
gmp_random_seed — Sets the RNG seed
seed
The seed to be set for the gmp_random(), gmp_random_bits(), and gmp_random_range() functions.
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Returns NULL
on success ������ʧ��ʱ���� FALSE
.
Issues an E_WARNING
and returns FALSE
if
seed
is not valid.
Example #1 gmp_random_seed() example
<?php
// set the seed
gmp_random_seed(100);
var_dump(gmp_strval(gmp_random(1)));
// set the seed to something else
gmp_random_seed(gmp_init(-100));
var_dump(gmp_strval(gmp_random_bits(10)));
// set the seed to something invalid
var_dump(gmp_random_seed('not a number'));
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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)