# gmp_random

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

gmp_random — Random number

Warning

This function has been DEPRECATED as of PHP 7.2.0. Relying on this function is highly discouraged.

### 说明

gmp_random ([ int `$limiter` = 20 ] ) : GMP

Generate a random number. The number will be between 0 and (2 ** n) - 1, where n is 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 32 or 64, but this is not guaranteed.

### 参数

`limiter`

  The limiter.

  可以是一个 GMP 数据 resouce，或一个可以转换为数值的字符串。

### 返回值

A random GMP number.

### 范例

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 limb

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

以上例程会输出：

    1915834968
    8642564075890328087