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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