The gmp_random_seed() is an inbuilt function in PHP which sets the RNG seed( Random Number Generation).
Syntax:
void gmp_random_seed ( mixed $seed )
Parameters: The gmp_random_seed() function accepts a single parameter as mentioned above and explained below:
- $seed: It is the only parameter required by the gmp_random_seed() function which is to be set for gmp_random(), gmp_random_range() and gmp_random_bits() functions. This parameter can be a GMP resource in PHP 5.5 or earlier, a GMP object in PHP version 5.6 and later, or also allowed to pass a numeric string provided that it is possible to convert that string to a number.
Return Value: The gmp_random_seed() function returns NULL on success and returns FALSE on failure.
Note:
Warning: The function generates an E-Warning and returns False if the seed is not valid.
Examples: Below programs illustrate the gmp_random_seed() function in PHP:
Program 1:
<?php // PHP code implementing the gmp_random_seed function // setting the seed gmp_random_seed(100); var_dump(gmp_strval(gmp_random(1))); ?> |
Output:
string(19) "7842303329126688544"
Program 2:
<?php //php code implementing the gmp_random_seed() function // set the seed to something else gmp_random_seed(gmp_init(-100)); var_dump(gmp_strval(gmp_random_bits(10))); ?> |
Output:
string(3) "800"
Program 3:
<?php //PHP code implementing gmp_random_seed() function // set the seed to something invalid var_dump(gmp_random_seed('not a number')); ?> |
Output:
gmp_random_seed(): Unable to convert variable to GMP - string is not an integer -- at line 5 bool(false)
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Reference: http://php.net/manual/en/function.gmp-random-seed.php
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