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php range method to implement non-repeating random numbers: 1. "$result = array_slice($numbers,0,$num);" method; 2. "while (list(, $number) = each ( $numbers)) {...}" method; 3. "array_slice($rand_array,0,$limit);" method; 4. "range(1,30);" method.
The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.
php range How to implement non-repeating random numbers?
Several methods for PHP to generate non-repeating random numbers
Method one:
<?php $numbers = range (1,50); //shuffle 将数组顺序随即打乱 shuffle ($numbers); //array_slice 取该数组中的某一段 $num=6; $result = array_slice($numbers,0,$num); print_r($result); ?>
Method two:
<?php $numbers = range (1,20); //播下随机数发生器种子,可有可无,测试后对结果没有影响 srand ((float)microtime()*1000000); shuffle ($numbers); //跳过list第一个值(保存的是索引) while (list(, $number) = each ($numbers)) { echo "$number "; } ?>
Method three:
<?php function NoRand($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()); ?>
Method four:
<?php $tmp=array(); while(count($tmp)<5){ $tmp[]=mt_rand(1,20); $tmp=array_unique($tmp); } print_r($tmp); ?>
Method five:
<?php $tmp = range(1,30); print_r(array_rand($tmp,10)); ?>
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