php 实现抽奖功能

记录借载

核心算法

<?php

namespace app\Server;

class LuckDraw
{
    public static function get_rand($arr){
        $result = '';

        $proSum = array_sum($arr);

        foreach ($arr as $key => $proCur){ //1 5 10 12 22 50

            $randNum = mt_rand(1,$proSum);

            if ($randNum <= $proCur){
                $result = $key;
                break;
            }else{
                $proSum -= $proCur;
            }
        }

        unset($arr);
        return $result;
    }
}

控制器调用

public function luckDraw(){
        $prize = array(
            array('id' => 1,'text' => '2022 ipad Pro','v' => 1),
            array('id' => 2,'text' => 'iphone 12','v' => 5),
            array('id' => 3,'text' => '华为p50','v' => 10),
            array('id' => 4,'text' => '一加手机','v' => 12),
            array('id' => 5,'text' => '小米14','v' => 22),
            array('id' => 6,'text' => '很遗憾未中奖','v' => 50),
        );

        $prize = array_combine(array_column($prize,'id'),$prize);

        foreach ($prize as $key => $val){
            $arr[$val['id']] = $val['v'];
        }

        $rid = LuckDraw::get_rand($arr);

        $res['yes'] = $prize[$rid]['text'];
        unset($prize[$rid]);

        shuffle($prize);

        for ($i = 0; $i < count($prize);$i++){
            $pr[] = $prize[$i]['text'];
        }

        $res['no'] = $pr;
        dd($res);


    }