PHP generates a certain number of non repeating random numbers

From , 2 Years ago, written in PHP, viewed 84 times.

<?php
/*
* array unique_rand( int $min, int $max, int $num )
* 生成一定数量的不重复随机数
* $min 和 $max: 指定随机数的范围
* $num: 指定生成数量
*/
function unique_rand($min, $max, $num) {
    $count = 0;
    $return = array();
    while ($count < $num) {
        $return[] = mt_rand($min, $max);
        $return = array_flip(array_flip($return));
        $count = count($return);
    }
    shuffle($return);
    return $return;
}
 
$arr = unique_rand(1, 25, 16);
sort($arr);
 
$result = '';
for($i=0; $i < count($arr);$i++)
{
        $result .= $arr[$i].',';
}
$result = substr($result, 0, -1);
echo $result;
?>
 

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PHP generates a certain number of non repeating random numbers

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