php教程

gmp_random

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

gmp_randomRandom 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

User Contributed Notes

asphp at dsgml dot com 27-Mar-2016 03:48
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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