gmp_random

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

gmp_randomRandom number

警告

本函数已自 PHP 7.2.0 起被废弃,并自 PHP 8.0.0 起被移除。 强烈建议不要依赖本函数。

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.

警告

本函数并不会生成安全加密的值,并且不可用于加密或者要求返回值不可猜测的目的。

如果需要加密安全随机,则可以将 Random\Engine\Secure 引擎用于 Random\Randomizer。对于简单的用例,random_int()random_bytes() 函数提供了操作系统的 CSPRNG 支持的方便且安全的 API

参数

limiter

The limiter.

GMP 对象或 int ,或数字string

返回值

A random GMP number.

示例

示例 #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";
?>

以上示例会输出:

1915834968
8642564075890328087

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