gmp_random_seed

(PHP 7)

gmp_random_seed — Sets the RNG seed

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gmp_random_seed ( mixed $seed ) : void

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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 锟斤拷锟斤拷锟斤拷失锟斤拷时锟斤拷锟斤拷 FALSE.

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

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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)

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