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# 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.

範例 1. gmp_random() example

`<?php $rand1 = gmp_random(1); // random number from 0 to 1 * bits per limb $rand2 = gmp_random(2); // random number from 0 to 2 * bits per limb echo gmp_strval($rand1) . "\n"; echo gmp_strval($rand2) . "\n"; ?>`

The printout of the above program might be:

    1915834968
    8642564075890328087

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