在项目开发中经常会遇到花钱抽奖类型的需求。但是老板总是担心用户用小钱抽到大奖。这样会导致项目亏损。下边这段代码可以有效制止抽奖项目亏钱。

个人奖池：

语言：thinkphp redis mysql

表：desire抽奖商品表 desire_log用户抽奖奖品表 user_desire_log用户抽奖记录表   desire_risk抽奖风控表

需求：用户奖池分为进行中奖池 和已完成奖池 当用户抽到大奖后 用户个人奖池重置 否则将继续抽奖 最后一次抽奖必中大奖 通过风控金额来判断用户是否可以抽大奖

　　当所有用户已完成的抽奖 盈利大于风控金额的时候可以让用户抽大奖 否则用户抽不到大奖

<?php 

　　　//抽奖接口

 public function desire()
 {
  $userData = $this->userSessionData();///用户的唯一标识
  $time = time();
  $this->limit_reward_time($userData['id'], $time);///限制抽奖间隔时间 防止被恶意刷奖品
  //活动开启开关
  $num = input('num/d');
  if (!$num) {
   output('1008', '参数错误');
  }
  if ($num!=1){
   if ($num !=10){
    if ($num !=100){
     output('1008', '参数错误');
    }else{
     $send = $this->draw($num);
    }
   }else{
    $send = $this->draw($num);
   }
  }else{
   $send = $this->draw($num);
  }
  if ($send != '金币不足') {
   output('200', '列表', $send);
  } else {
   output('1012', $send);
  }
 }



　　/////抽奖核心
　　
 public function draw($num)
 {
  $userData = $this->userSessionData();
  $resultSend = Cache::get('奖池名称加上用户的唯一标识，确保一人一奖池' . $userData['id']);//获取个人奖池
  if (!empty($resultSend)) {
   $userRedis = unserialize(Cache::get('newdesiredraw' . $userData['id']));///将奖池序列化
  } else {
   $userRedis = '';///当前用户不存在奖池
  }
　　　　 ///查询当前用户的金币
  $desireDiamonds = Db::connect('db_qmconfig')->name('user_money')->where(['uid' => $userData['id']])->field('diamonds')->find();
  $sendNum = $num;
  if ($desireDiamonds['diamonds'] < $num) {
   return ['msg' => '金币不足'];///判断当前用户的金币是不是够抽奖
  }
  $gift_height = 0;///检测是否更新个人奖池和抽奖数量
  $newNum = 0;///检测下一轮抽奖数量
  $suiji = Db::connect('db_qmconfig')->name('desire')->order('num desc')->find();///随机小礼物
  if ($userRedis) {///如果用户奖池存在
   $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();
　　　　　　　　///查询抽奖表的礼物
   if (!$gift){
    return ['msg'=>'礼物查询错误'];
   }
　　　　　　　///查询用户的总抽奖数量
   $user_all = Db::connect('db_qmconfig')->name('user_desire_log')->order('kind desc')
    ->where(['uid'=>$userData['id'],'state'=>0])->field('SUM(num) as kindNum')->find();
   //十次抽奖 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;
   }

   ///百次抽奖 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 = $num - 1;
     }
    }
   }
　　　　　　　 ////判断当前奖池的奖品是否够此次抽奖 如果奖池奖品数量不够此次抽奖 将此次奖池抽完后 获取剩下要抽将的数量 重置奖池 并且递归此方法传入剩下要抽的数量
   if ($count < $num) {
    $newNum = $num - $count;
    $num = $count;
   }
   $user = Db::connect('db_qmconfig')
    ->name('desire_log')->where(['uid' => $userData['id']])
    ->field('SUM(num) as num')
    ->find();///已抽数量
   if (!$user){
    return ['msg'=>'已抽数量有误'];
   }
   $res['zongshu'] = Db::connect('db_qmconfig')
    ->name('desire')->where(['state' => 1])
    ->field('SUM(num) as num,checksum')
    ->find();///总数量
   if (!$res['zongshu']){
    return ['msg'=>'总数量有误'];
   }
   $resNum = 0;
   ////获取个人多少次抽奖
   if (($user['num']+$sendNum) > $res['zongshu']['checksum']) {
    $res['zongshu']['user_num'] = $user['num'] % $res['zongshu']['checksum']; ///获取余数
    if (($res['zongshu']['user_num'] + $sendNum) > $res['zongshu']['checksum']) {
     ///获取这次抽奖的数量
     $resNum = $sendNum - (($res['zongshu']['user_num'] + $sendNum) - $res['zongshu']['checksum']);
    }
//    return ['msg'=>$res['zongshu']['user_num']];
   }else{
    $res['zongshu']['user_num'] = $user['num'];
   }
   $cruuy = 0;
   ///随机选择奖池
   for ($i = 0; $i < $num; $i++) {
    $send = array_rand($userRedis);
    if ($resNum > 0) {
     ///如果本轮奖池抽完 并且没有抽到大奖 那么必中大奖
     $result[] = $gift['id'];
     $gift_height = 1;//抽到大奖后更改三个变量状态
     $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);
　　　　　　　　　　　　　　///如果抽到大奖
      if ($all['num']==null){
　　　　　　　　　　　　　　　　　///如果这是整个奖池第一轮抽奖 那么可以中大奖
       $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();
　　　　　　　　　　　　　　　　　///查询奖池风控金额
       $reskList = Db::connect('db_qmconfig')->name('desire_risk')->find();
       $riskPrice = $all['num'] * 20 - $alls['num'];
　　　　　　　　　　　　　　　　　///如果风控金额小于当前已完成抽奖的金额 那么代表软件处于盈利状态 可以中大奖
       if (($riskPrice >= $reskList['price'])&&($cruuy==0)){
        $result[] = $userRedis[$send];
        $gift_height = 1;
        $cruuy = 1;
       } else{
　　　　　　　　　　　　　　　　　　　///如果风控金额大于当前已完成抽奖金额 不能中大奖 随机选择一次小奖品 替换大奖
        $result[] = $suiji['giftid'];
       }
      }

     }else{
      $result[] = $userRedis[$send];
     }
    }
　　　　　　　　　　///清空个人奖池此次抽奖的礼物
    unset($userRedis[$send]);
   }
　　　　　　　////新增用户抽奖次数 
   $result = array_count_values($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;
　　　　　　　////更改此轮抽奖后 用户奖池的状态
   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)) {
     ///如果这次抽奖大于奖池总数 那么更新奖池并且抽奖剩下的次数
     Cache::set('newdesiredraw' . $userData['id'], serialize([]));
     return $this->draw($sendNum - ($k + 1));
    }

　　　　　　　　 ////礼物新增用户背包　　
    $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);
    }
   }
　　　　　　　 ///增加用户消费记录
   $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) {
　　　　　　　　　　///扣除用户金币
    $newDiamondsData = [
     'diamonds' => $desireDiamonds['diamonds'] - $sendNum
    ];
    $newDiamonds = Db::connect('db_qmconfig')->name('user_money')->where(['uid' => $userData['id']])->update($newDiamondsData);
   }
　　　　　　　　

   if ($userRedis) {
    Cache::set('用户奖池名称' . $userData['id'], serialize($userRedis));
　　　　　　　　　 ////如果此轮抽奖抽到大奖 重置用户个人奖池
    if ($gift_height == 1) {
     Cache::set('用户奖池名称' . $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,
     ];
　　　　　　　　　　　　///添加礼物抽中记录
     $desireLogUser = Db::connect('db_qmconfig')->name('desire_log')->insert($desireLogUserWhere);
    }
    $swhere[] = ['d.state', '=', 1];
    $swhere[] = ['d.kind', '=', 1];
    $res['data'] = $this->giftInfo($swhere);
    if (empty($res['data'])) {
     output('1008', '奖池更新中');
    }
　　　　　　　　　　////获取用户此轮抽奖数量 返回给前端 控制奖池动画百分比
    $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 {
　　　　　　　　　　////如果当前用户奖池抽完奖了 那么重置此用户奖池
    $where[] = ['d.state', '=', 1];
    $where[] = ['d.kind', '=', 1];
    $res = $this->giftInfo($where);
    if (empty($res)) {
     return ['msg' => '奖池更新中'];
    }
    $c = [];
    foreach ($res as $m => $n) {
　　　　　　　　　　///十抽必中奖品
     if ($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;
      }
     }
　　　　　　　　　　　　///百抽必中奖品
     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, $giftarr);
    }
　　　　　　　　　　///随机打乱奖池
    shuffle($c);
    Cache::set('用户奖池名称' . $userData['id'], serialize($c));
    if ($newNum>0){
　　　　　　　　　　　　 ///递归此方法 抽剩下的奖品
     return $this->draw($newNum);
    }
   }
  } else {
   ///如果没有奖池 生成奖池
   $where[] = ['d.state', '=', 1];
   $where[] = ['d.kind', '=', 1];
   $res = $this->giftInfo($where);
   if (empty($res)) {
    return ['msg' => '奖池更新中'];
   }
   $c = [];
   foreach ($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[【本文转自：游戏服务器 转载请保留连接】'num'], $n['id']);
    $c = array_merge($c, $giftarr);
   }
   shuffle($c);
   Cache::set('用户奖池名称' . $userData['id'], serialize($c));
　　　　　　　///递归此方法抽奖
   return $this->draw($num);
  }
 }
?>

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