The complete code for implementing bubble sorting and binary search in PHP

This article brings you the complete code for implementing bubble sorting and binary search in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be useful to you. helped.

<?php
    /*
     *冒泡排序
     */
    function maopao($array){
        for($i =0;$i < count($array);$i++){
            for($j = $i+1;$j < count($array);$j++){
                if($array[$i] > $array[$j]){
                    $temp = $array[$i];
                    $array[$i] = $array[$j];
                    $array[$j] = $temp;
                }
            }
        }
        return $array;
    }

    /*
     * 二分查找
     */

    function erfen($array,$search,$low = 0,$hight = 100)
    {
        $midPostion = floor(($low + $hight)/2);
        $midData = $array[$midPostion];
        if($midData == $search)
        {
            return $midPostion;
        }
        if($search < $midData)
        {
            $hight = $midPostion;
            if($hight == 0)
            {
                return false;
            }
            return erfen($array,$search,$low,$hight);
        }else{
            $low = $midPostion + 1;
            if($low > $hight){
                return false;
            }
            return erfen($array,$search,$low,$hight);
        }
    }

    /*
     * 100+99+98+.......1;
     */

    function leijia($n)
    {
        if($n == 1){
            return $n;
        }
        return $n + leijia($n-1);
    }


    $a= array(9,4,6,8,2,4,5,1);
    $b= maopao($a);

    $c = array(1,2,3,4,5,6,7,8,9);
    $k = 5;
    $d = erfen($c,$k,0,8);

    $sum = leijia(100);
    echo $sum;

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