How to implement non-repeating random numbers in php range

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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