PHP basic algorithm bubble sorting method

This article shares the code of the bubble sorting method in the basic algorithm of PHP. Friends in need can refer to it

<?php
//冒泡排序法
function bubbleSort ($arr)
{
    $len = count($arr);
         //该层循环控制 需要冒泡的轮数
         for ($i=1; $i<$len; $i++) {
             //该层循环用来控制每轮 冒出一个数 需要比较的次数
             for ($k=0; $k<$len-$i; $k++) {
                if($arr[$k] > $arr[$k+1]) {
                 $tmp = $arr[$k+1]; // 声明一个临时变量
                 $arr[$k+1] = $arr[$k];
                 $arr[$k] = $tmp;
                 }
            }
     }
 return $arr;
}
?>

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