Home > Backend Development > PHP Tutorial > 求一个指定范围内多个不重复随机数~

求一个指定范围内多个不重复随机数~

WBOY
Release: 2016-06-23 13:37:33
Original
806 people have browsed it

例如500以内6个不重复数
又快又省最好了
谢谢高手了!


回复讨论(解决方案)

for($i=0; $i<6; $i++)  echo rand(1, 500), PHP_EOL;
Copy after login
Copy after login
绝不重复,不信你试

用arrayfille做一个1-500的数组
shuffle洗牌,arrayslice取前6个

for($i=0; $i<6; $i++)  echo rand(1, 500), PHP_EOL;
Copy after login
Copy after login
绝不重复,不信你试


274 335 220 220 350 215

是不是该买彩票呢?

<?php function unique_random(& $result, $size=6, $min=0, $max=500){    $num = mt_rand($min, $max);    !in_array($num, $result) && array_push($result, $num);        return count($result) >= $size ? $result : unique_random($result, $size, $min, $max);}$result = array();unique_random($result);print_r($result);
Copy after login


Array(    [0] => 132    [1] => 351    [2] => 43    [3] => 425    [4] => 449    [5] => 269)
Copy after login

500个这么小的pool,完全可以用空间换时间。

$arr = array();for($i=1;$i<=500; $i++){    array_push($arr, $i);}shuffle($arr);$ret = array_slice($arr, 0, 6);print_r($ret);
Copy after login

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template