SunshinePHP Developer Conference 2015

gmp_random

(PHP 4 >= 4.0.4, PHP 5)

gmp_randomRandom number

说明

GMP gmp_random ([ int $limiter = 20 ] )

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.

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

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