php中有很多自带的随机函数这些函数可以生成随机的但多次之后可能会重复,下面整理了一些 产生不重复随机数的函数。
无论是Web应用,还是WAP或者移动应用,随机数都有其用武之地。在最近接触的几个小项目中,我也经常需要和随机数或者随机数组打交道,所以,对于PHP如何产生不重复随机数常用的几种方法小结一下(ps:方法1、4、5是我常用的,其余来自网络整理)
方法一:
代码如下 | 复制代码 |
$numbers = range (1,50); //shuffle 将数组顺序随即打乱 shuffle ($numbers); //array_slice 取该数组中的某一段 $num=6; $result = array_slice($numbers,0,$num); print_r($result); ?> |
方法二:
代码如下 | 复制代码 |
$numbers = range (1,20); //播下随机数发生器种子,可有可无,测试后对结果没有影响 srand ((float)microtime()*1000000); shuffle ($numbers); //跳过list第一个值(保存的是索引) while (list(, $number) = each ($numbers)) { echo "$number "; } ?> |
方法三:
代码如下 | 复制代码 |
function NoRand($begin=0,$end=20,$limit=5){ $rand_array=range($begin,$end); shuffle($rand_array);//调用现成的数组随机排列函数 return array_slice($rand_array,0,$limit);//截取前$limit个 } print_r(NoRand()); ?> |
上述可以在1-20间随机产生5个不重复的值
方法四:
代码如下 | 复制代码 |
$tmp=array(); while(count($tmp) $tmp[]=mt_rand(1,20); $tmp=array_unique($tmp); } print_r($tmp); ?> |
方法五:
代码如下 | 复制代码 |
$tmp = range(1,30); |
这个可能是比叫简单的了(ps:如果在range中指定了步长,就必须注意array_rand的第二个参数是否超出$tmp的长度)。
PHP提供非常丰富的数组函数,产生随机数大多可以从数组这个角度出发,若你还有方法提供,欢迎给出,文章将持续更新。

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