在專案開發中經常會遇到花錢抽獎型別的需求。但是老闆總是擔心使用者用小錢抽到大獎。這樣會導致專案虧損。下邊這段程式碼可以有效制止抽獎專案虧錢。

個人獎池：

語言：thinkphp redis mysql

表：desire抽獎商品表desire_log使用者抽獎獎品表user_desire_log使用者抽獎記錄表 desire_risk抽獎風控表

需求：使用者獎池分為進行中獎池 和已完成獎池 當使用者抽到大獎後 使用者個人獎池重置 否則將繼續抽獎 最後一次抽獎必中大獎 通過風控金額來判斷使用者是否可以抽大獎

　　當所有使用者已完成的抽獎 盈利大於風控金額的時候可以讓使用者抽大獎 否則使用者抽不到大獎

<?php

　　　//抽獎介面

    public function desire()
    {
        $userData = $this->userSessionData();///使用者的唯一標識
        $time = time();
        $this->limit_reward_time($userData['id'], $time);///限制抽獎間隔時間 防止被惡意刷獎品
        //活動開啟開關
        $num = input('num/d');
        if (!$num) {
            output('1008', '引數錯誤');
 
        }
        if ($num!=1){
            if ($num !=10){
                if ($num !=100){
                    output('1008', '引數錯誤');
                }else{
                    $send = $this->draw($num);
                }
            }else{
                $send = $this->draw($num);
            }
        }else{
 
            $send = $this->draw($num);
        }
        if ($send != '金幣不足') {
            output('200', '列表', $send);
        } else {
            output('1012', $send);
        }
    }

　　/////抽獎核心
　　

    public function draw($num)
    {
        $userData = $this->userSessionData();
        $resultSend = Cache::get('獎池名稱加上使用者的唯一標識，確保一人一獎池' . $userData['id']);//獲取個人獎池
        if (!empty($resultSend)) {
            $userRedis = unserialize(Cache::get('newdesiredraw' . $userData['id']));///將獎池序列化
        } else {
            $userRedis = '';///當前使用者不存在獎池
        }
　　　　 ///查詢當前使用者的金幣
        $desireDiamonds = Db::connect('db_qmconfig')->name('user_money')->where(['uid' => $userData['id']])->field('diamonds')->find();
        $sendNum = $num;
        if ($desireDiamonds['diamonds'] < $num) {
            return ['msg' => '金幣不足'];///判斷當前使用者的金幣是不是夠抽獎
        }
        $gift_height = 0;///檢測是否更新個人獎池和抽獎數量
        $newNum = 0;///檢測下一輪抽獎數量
        $suiji = Db::connect('db_qmconfig')->name('desire')->order('num desc')->find();///隨機小禮物
        if ($userRedis) {///如果使用者獎池存在
            $joins = [
                ['gift_info f', 'd.giftid = f.id']
            ];
            $gift = Db::connect('db_qmconfig')->name('desire')
                ->alias('d')
                ->join($joins)
                ->where(['d.state' => 1])
                ->order('f.price desc')
                ->field('f.name,f.price,f.egif,d.num,f.id,d.position')->find();
　　　　　　　　///查詢抽獎表的禮物
            if (!$gift){
                return ['msg'=>'禮物查詢錯誤'];
            }
　　　　　　　///查詢使用者的總抽獎數量
            $user_all = Db::connect('db_qmconfig')->name('user_desire_log')->order('kind desc')
                ->where(['uid'=>$userData['id'],'state'=>0])->field('SUM(num) as kindNum')->find();
            //十次抽獎 必中
            $count = count($userRedis);
            if ($num == 10) {
                $where[] = ['d.state', '=', 1];
                $where[] = ['d.ten', '=', 1];
                $giftId = $this->giftInfo($where);
                if ($giftId) {
                    $result[] = $giftId[0]['id'];
                }
                $num = $num - 1;
            }

            ///百次抽獎 必中
            if ($num == 100) {
                $where[] = ['d.state', '=', 1];
                $where[] = ['d.hundred', '=', 1];
                $giftId = $this->giftInfo($where);

                $lwhere[] = ['d.state', '=', 1];
                $lwhere[] = ['d.ten', '=', 1];
                $lgiftId = $this->giftInfo($lwhere);
                if ($lgiftId) {
                    for ($l=0;$l<10;$l++){
                        $result[] = $lgiftId[0]['id'];
                    }
                }

                if ($giftId) {
                    $result[] = $giftId[0]['id'];
                }
                $num = $num - 11;
            }
            if ($num ==1){
                if ($user_all){
                    $number1 = '';
                    $num1 = str_split($user_all['kindNum']);
                    $number = $num1[count($num1) - 1];
                    if ($user_all['kindNum']>98){
                        $number1 = $num1[count($num1) - 2];
                    }
                    if (($number==9)&& ($number1 !=9)){ //十抽必中
                        $where[] = ['d.state', '=', 1];
                        $where[] = ['d.ten', '=', 1];
                        $giftId = $this->giftInfo($where);
                        if ($giftId) {
                            $result[] = $giftId[0]['id'];
                        }
                        $num = $num - 1;
                    }

                    if (($number1==9) && ($number==9)){//百抽必中
                        $where[] = ['d.state', '=', 1];
                        $where[] = ['d.hundred', '=', 1];
                        $giftId = $this->giftInfo($where);
                        if ($giftId) {
                            $result[] = $giftId[0]['id'];
                        }
                        $num = $num - 1;
                    }
                }
            }
　　　　　　　 ////判斷當前獎池的獎品是否夠此次抽獎 如果獎池獎品數量不夠此次抽獎 將此次獎池抽完後 獲取剩下要抽將的數量 重置獎池 並且遞迴此方法傳入剩下要抽的數量
            if ($count < $num) {
                $newNum = $num - $count;
                $num = $count;
            }
            $user = Db::connect('db_qmconfig')
                ->name('desire_log')->where(['uid' => $userData['id']])
                ->field('SUM(num) as num')
                ->find();///已抽數量
            if (!$user){
                return ['msg'=>'已抽數量有誤'];
            }
            $res['zongshu'] = Db::connect('db_qmconfig')
                ->name('desire')->where(['state' => 1])
                ->field('SUM(num) as num,checksum')
                ->find();///總數量
            if (!$res['zongshu']){
                return ['msg'=>'總數量有誤'];
            }
            $resNum = 0;
            ////獲取個人多少次抽獎
            if (($user['num']+$sendNum) > $res['zongshu']['checksum']) {
                $res['zongshu']['user_num'] = $user['num'] % $res['zongshu']['checksum']; ///獲取餘數
                if (($res['zongshu']['user_num'] + $sendNum) > $res['zongshu']['checksum']) {
                    ///獲取這次抽獎的數量
                    $resNum = $sendNum - (($res['zongshu']['user_num'] + $sendNum) - $res['zongshu']['checksum']);
                }
//                return ['msg'=>$res['zongshu']['user_num']];
            }else{
                $res['zongshu']['user_num'] = $user['num'];
            }
            $cruuy = 0;
            ///隨機選擇獎池
            for ($i = 0; $i < $num; $i++) {
                $send = array_rand($userRedis);
                if ($resNum > 0) {
                    ///如果本輪獎池抽完 並且沒有抽到大獎 那麼必中大獎
                    $result[] = $gift['id'];
                    $gift_height = 1;//抽到大獎後更改三個變數狀態
                    $resNum=0;
                    $cruuy = 1;
                } else {
                    if ($userRedis[$send]==$gift['id']){
                        $haveJoin = [
                            ['desire_log d', 'd.cid = u.id'],
                            ['gift_info f', 'd.giftid = f.id']
                        ];
                        $all  = Db::connect('db_qmconfig')
                            ->name('user_desire_log')
                            ->alias('u')
                            ->where(['u.state'=>1])
                            ->field('SUM(u.num) as num')->find();
//                        var_dump($all);
　　　　　　　　　　　　　　///如果抽到大獎
                        if ($all['num']==null){
　　　　　　　　　　　　　　　　　///如果這是整個獎池第一輪抽獎 那麼可以中大獎
                            $result[] = $suiji['giftid'];
                        }else{
　　　　　　　　　　　　　　　　　
                            $alls  = Db::connect('db_qmconfig')->name('user_desire_log')
                                ->alias('u')
                                ->where(['u.state'=>1])
                                ->join($haveJoin)
                                ->field('SUM(f.price*d.num) as num')->find();
　　　　　　　　　　　　　　　　　///查詢獎池風控金額
                            $reskList = Db::connect('db_qmconfig')->name('desire_risk')->find();
                            $riskPrice = $all['num'] * 20 - $alls['num'];
　　　　　　　　　　　　　　　　　///如果風控金額小於當前已完成抽獎的金額 那麼代表軟體處於盈利狀態 可以中大獎
                            if (($riskPrice >= $reskList['price'])&&($cruuy==0)){
                                $result[] = $userRedis[$send];
                                $gift_height = 1;
                                $cruuy = 1;
                            } else{
　　　　　　　　　　　　　　　　　　　///如果風控金額大於當前已完成抽獎金額 不能中大獎 隨機選擇一次小獎品 替換大獎
                                $result[] = $suiji['giftid'];
                            }
                        }

                    }else{
                        $result[] = $userRedis[$send];
                    }
                }
　　　　　　　　　　///清空個人獎池此次抽獎的禮物
                unset($userRedis[$send]);
            }
　　　　　　　////新增使用者抽獎次數 
            $result = array_count_values($result);
            $user_desire_list = Db::connect('db_qmconfig')->name('user_desire_log')->order('id desc')->where(['uid'=>$userData['id']])->find();
            if ($user_desire_list){
                if ($user_desire_list['state']==0){
                    $user_desire_logData[ 'kind'] = $user_desire_list['kind']+1;
                }else{
                    $user_desire_logData[ 'kind'] = 1;
                }
            }else{
                $user_desire_logData[ 'kind'] = 1;

            }
            $user_desire_logData['uid'] =$userData['id'];
            $user_desire_logData['ctime'] =time();
            $user_desire_logData['num'] =$sendNum;
　　　　　　　////更改此輪抽獎後 使用者獎池的狀態
            if ($gift_height==1){
                $user_desire_log_update = Db::connect('db_qmconfig')->name('user_desire_log')
                    ->where(['uid'=>$userData['id'],'state'=>0])->update(['state'=>1]);
                $user_desire_logData[ 'state'] = 1;
            }else{
                $user_desire_logData[ 'state'] = 0;
            }
            $user_desire_log = Db::connect('db_qmconfig')->name('user_desire_log')->insertGetId($user_desire_logData);
            foreach ($result as $k => $v) {
                if ($resNum == ($k + 1)) {
                    ///如果這次抽獎大於獎池總數 那麼更新獎池並且抽獎剩下的次數
                    Cache::set('newdesiredraw' . $userData['id'], serialize([]));
                    return $this->draw($sendNum - ($k + 1));
                }

　　　　　　　　   ////禮物新增使用者揹包　　
                $data = [
                    'uid' => $userData['id'],
                    'giftid' => $k,
                    'num' => $v,
                    'ctime' => time(),
                    'cid' => $user_desire_log
                ];
                $join = [
                    ['gift_info f', 'd.giftid = f.id']
                ];
                $gift_info = Db::connect('db_qmconfig')->name('desire')
                    ->alias('d')
                    ->join($join)
                    ->where(['d.giftid' => $k])
                    ->field('f.name,f.egif,d.position')->find();
                $gift_infonum['num'] = $v;
                $list['gift'][] = array_merge($gift_info, $gift_infonum);
                $desireLog = Db::connect('db_qmconfig')->name('desire_log')->insert($data);
                $userKnapsack = Db::connect('db_qmconfig')->name('gift_knapsack')->where(['uid' => $userData['id'], 'giftid' => $k])->field('id,num')->find();
                if ($userKnapsack) {
                    $userKnapsackData = [
                        'num' => $v + $userKnapsack['num'],
                        'updatetime' => time()
                    ];
                    $userKnapsackUpdate = Db::connect('db_qmconfig')->name('gift_knapsack')->where(['id' => $userKnapsack['id']])->update($userKnapsackData);
                } else {
                    $userKnapsackData = [
                        'num' => $v,
                        'giftid' => $k,
                        'uid' => $userData['id'],
                        'createtime' => time()
                    ];
                    $userKnapsackInsert = Db::connect('db_qmconfig')->name('gift_knapsack')->insert($userKnapsackData);
                }
            }
　　　　　　　 ///增加使用者消費記錄
            $userXfData = [
                'uid' => $userData['id'],
                'xf_price' => $sendNum,
                'xf_method' => 5,
                'scene' => 19,
                'status' => 1,
                'ctime' => time()
            ];
            $userXf = Db::connect('db_qmconfig')->name('xfprice')->insert($userXfData);
            if ($desireLog && $userXf) {
　　　　　　　　　　///扣除使用者金幣
                $newDiamondsData = [
                    'diamonds' => $desireDiamonds['diamonds'] - $sendNum
                ];
                $newDiamonds = Db::connect('db_qmconfig')->name('user_money')->where(['uid' => $userData['id']])->update($newDiamondsData);
            }
　　　　　　　　

            if ($userRedis) {
                Cache::set('使用者獎池名稱' . $userData['id'], serialize($userRedis));
　　　　　　　　　 ////如果此輪抽獎抽到大獎 重置使用者個人獎池
                if ($gift_height == 1) {
                    Cache::set('使用者獎池名稱' . $userData['id'], serialize([]));

                    $userChecksum = $res['zongshu']['checksum'] - ($res['zongshu']['user_num'] + $sendNum);
                    $desireLogUserWhere = [
                        'uid' => $userData['id'],
                        'giftid' => 0,
                        'num' => $userChecksum,
                        'ctime' => time(),
                        'cid' => $user_desire_log,
                    ];
　　　　　　　　　　　　///新增禮物抽中記錄
                    $desireLogUser = Db::connect('db_qmconfig')->name('desire_log')->insert($desireLogUserWhere);
                }
                $swhere[] = ['d.state', '=', 1];
                $swhere[] = ['d.kind', '=', 1];
                $res['data'] = $this->giftInfo($swhere);
                if (empty($res['data'])) {
                    output('1008', '獎池更新中');
                }
　　　　　　　　　　////獲取使用者此輪抽獎數量 返回給前端 控制獎池動畫百分比
                $res['zongshu'] = Db::connect('db_qmconfig')
                    ->name('desire')->where(['state' => 1, 'kind' => 1])
                    ->field('checksum as num')
                    ->find();
                $user = Db::connect('db_qmconfig')
                    ->name('desire_log')->where(['uid' => $userData['id']])
                    ->field('SUM(num) as num')
                    ->find();
                $res['diamonds'] = Db::connect('db_qmconfig')
                    ->name('user_money')->where(['uid' => $userData['id']])
                    ->value('diamonds');

                if ($user) {
                    if ($user['num'] > $res['zongshu']['num']) {
                        $res['zongshu']['user_num'] = $user['num'] % $res['zongshu']['num'];

                    } else {
                        $res['zongshu']['user_num'] = $user['num'];
                    }
                } else {
                    $res['zongshu']['user_num'] = 0;
                }
                $list['info'] = $res;
                return $list;
//                return ['msg'=>$res['zongshu']['user_num']];
            } else {
　　　　　　　　　　////如果當前使用者獎池抽完獎了  那麼重置此使用者獎池
                $where[] = ['d.state', '=', 1];
                $where[] = ['d.kind', '=', 1];
                $res = $this->giftInfo($where);
                if (empty($res)) {
                    return ['msg' => '獎池更新中'];
                }
                $c = [];
                foreach ($res as $m => $n) {
　　　　　　　　　　///十抽必中獎品
                    if ($n['ten']==1){
                        $n['num'] = $n['num'] - $n['checksum']/10;
                        $giftarr = array_fill(0, $n['num']+$n['checksum']/10, $suiji['giftid']);
                        $c = array_merge($c, $giftarr);
                        if ($n['num']<=0){
                            continue;
                        }
                    }
　　　　　　　　　　　　///百抽必中獎品
                    if ($n['hundred']==1){
                        $n['num'] = $n['num'] - $n['checksum']/100;
                        $giftarr = array_fill(0, $n['num']+$n['checksum']/100, $suiji['giftid']);
                        $c = array_merge($c, $giftarr);
                        if ($n['num']<=0){
                            continue;
                        }
                    }
                    $giftarr = array_fill(0, $n['num'], $n['id']);
                    $c = array_merge($c, $giftarr);
                }
　　　　　　　　　　///隨機打亂獎池
                shuffle($c);
                Cache::set('使用者獎池名稱' . $userData['id'], serialize($c));
                if ($newNum>0){
　　　　　　　　　　　　 ///遞迴此方法 抽剩下的獎品
                    return $this->draw($newNum);
                }
            }
        } else {
            ///如果沒有獎池 生成獎池
            $where[] = ['d.state', '=', 1];
            $where[] = ['d.kind', '=', 1];
            $res = $this->giftInfo($where);
            if (empty($res)) {
                return ['msg' => '獎池更新中'];
            }
            $c = [];
            foreach ($res as $m => $n) {
                if ($n['ten']==1){
                    $n['num'] = $n['num'] - $n['checksum']/10;
                    $giftarr = array_fill(0, $n['num']+$n['checksum']/10, $suiji['giftid']);
                    $c = array_merge($c, $giftarr);
                    if ($n['num']<=0){
                        continue;
                    }
                }
                if ($n['hundred']==1){
                    $n['num'] = $n['num'] - $n['checksum']/100;
                    $giftarr = array_fill(0, $n['num']+$n['checksum']/100, $suiji['giftid']);
                    $c = array_merge($c, $giftarr);
                    if ($n['num']<=0){
                        continue;
                    }
                }
                $giftarr = array_fill(0, $n['num'], $n['id']);
                $c = array_merge($c, $giftarr);
            }
            shuffle($c);
            Cache::set('使用者獎池名稱' . $userData['id'], serialize($c));
　　　　　　　///遞迴此方法抽獎
            return $this->draw($num);
        }
    }

?>