gmp_random

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

gmp_random — Random 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