php[tek] 2017: Atlanta


(PHP 4 >= 4.0.4, PHP 5, PHP 7)

gmp_randomRandom number


GMP gmp_random ([ int $limiter = 20 ] )

Generate a random number. The number will be between zero and the number of bits per limb multiplied by limiter. If limiter is negative, negative numbers are generated.

A limb is an internal GMP mechanism. The number of bits in a limb is not static, and can vary from system to system. Generally, the number of bits in a limb is either 16 or 32, but this is not guaranteed.



The limiter.

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

A random GMP number.


Example #1 gmp_random() example

gmp_random(1); // random number from 0 to 1 * bits per limb
$rand2 gmp_random(2); // random number from 0 to 2 * bits per limb

echo gmp_strval($rand1) . "\n";
gmp_strval($rand2) . "\n";

The above example will output:


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User Contributed Notes 1 note

asphp at dsgml dot com
9 months ago
Warning: Do not use this function.

Use gmp_random_bits() or gmp_random_range() instead.

The documentation and the code for this function do NOT match, and in any case this function is quite useless.
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