Random number gmp_prob_prime gmp_scan0 GMP Functions PHP Manual gmp_random (PHP 4 >= 4.0.4, PHP 5)gmp_random — Random number Description resource gmp_random ( int $limiter ) Generate a random number. The number will be between zero and the number of bits per limb multiplied by limiter . If limiter is negative, negative numbers are generated. A limb is an internal GMP mechanism. The number of bits in a limb is not static, and can vary from system to system. Generally, the number of bits in a limb is either 16 or 32, but this is not guaranteed. Parameters limiter The limiter. It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number. Return Values A random GMP number. Examples Example #1 gmp_random() example <?php$rand1 = gmp_random(1); // random number from 0 to 1 * bits per limb$rand2 = gmp_random(2); // random number from 0 to 2 * bits per limbecho gmp_strval($rand1) . "\n";echo gmp_strval($rand2) . "\n";?> The above example will output: 1915834968 8642564075890328087 gmp_prob_prime gmp_scan0 GMP Functions PHP Manual