How to generate non-repeating random numbers in php

How to generate non-repeating random numbers in php: 1. Use the function shuffle to randomly disrupt the order of the array, and take a certain section of the array, the code is [shuffle ($numbers)]; 2. Call The ready-made array randomly arranges the functions and intercepts the first [$limit] ones.

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php does not generate Method of repeating random numbers:

Method one:

The code is as follows:

<?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:

The code is as follows:

<?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 3:

The code is as follows:

<?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());
?>

The above can randomly generate 5 non-repeating values ​​between 1-20

Method 4:

The code is as follows:

<?php
$tmp=array();
while(count($tmp)<5){
$tmp[]=mt_rand(1,20);
$tmp=array_unique($tmp);
}
print_r($tmp);
?>

Method 5:

The code is as follows:

<?php
$tmp = range(1,30);
print_r(array_rand($tmp,10));
?>

This may be simpler than (ps: If the step size is specified in the range, you must pay attention to whether the second parameter of array_rand exceeds the length of $tmp).

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