用PHP做了一个领取优惠券活动的示例代码

/**
 * Function:优惠券领取处理
 * Author:cyw0413
 * @param $params
 * @return array
 * @throws \Exception
 */
public function doCoupon($params)
{
  $activity_id = $params['activity_id'];
  if(!$params){
    throw new \Exception("参数错误！");
  }

  $preg_phone = '/^1[34578]\d{9}$/ims';
  $is_mobile = preg_match ($preg_phone, $params['mobile']);
  if ($is_mobile == 0) {
    throw new \Exception("手机号码不正确！");
  }

  //隐藏手机号码中间4位
  $str_mobile = substr_replace($params['mobile'],'****',3,4);

  $activity = $this->find($activity_id);
  if(empty($activity)){
    throw new \Exception("不存在此活动");
  }

  $activity_link = $activity->activityLink->where('coupon_status',0); //只选择不停用的优惠券
  if(count($activity_link) <= 0){
    throw new \Exception("优惠券不存在或者已经停用");

  }else{

    //查找注册用户ID
    $showUser = $this->showUser($params['mobile']);
    //主要是过滤掉领取优惠券为0的，用laravel的同学注意看看
    $detail = $activity_link->each(function($item,$index) use ($showUser) {

      $diffCouponQuantity = $this->diffCouponQuantity($item['config_id'],$item['quantity'],$item['activity_id'],$showUser);
      $item->title = $this->getCouponName($item['config_id'])['name'];
      $item->number = $item['quantity'];
      $item->msg  = $diffCouponQuantity ['msg'];
      $item->diff   = $diffCouponQuantity ['diff'];
      $item->code   = $diffCouponQuantity ['code'];
    })->toArray();

    if(count($detail) == 1){
      foreach($detail as $val){
        if($val['diff'] == 1 && $val['code'] == '400'){
          throw new \Exception($detail[0]['msg']);
        }
      }

    }

    $collection_coupon = collect($detail);
    $collection_coupon = $collection_coupon->where('diff', '<=' ,'0');  //去除优惠券剩余数量为0，或者领取优惠券数量-剩余数量 > 0

  }
  //判断活动开始时间与优惠券开始时间
  $act_coupon = ActivityCouponBaseModel::where('activity_id',$activity['activity_id'])->first();
  $check_time = $this-> checkCouponTime($act_coupon['start_time'],$activity_link);
  if($check_time == 'error'){
    throw new \Exception("优惠券领取时间未开始,暂不可领取");
  }

  //领取活动有以下几种情况
  //1: 活动已结束
  if($activity['end_time'] < date("Y-m-d H:i:s") || $activity['status'] == 1){
    $result = [
      'code' => 1,
    ];
    return $result;
  }

  //6 活动为开始时
  if($activity['start_time'] > date("Y-m-d H:i:s") || $activity['status'] == 1){
    $result = [
      'code' => 6,
    ];
    return $result;

  }

  $checkUser = $this->haveUser($params['mobile']); //检查是新用户，还是老用户 根据自己的业务需求做，这个方法就不贴了
  //2: 活动为新用户领取，而领取的用户是老用户
  if($activity['user_type'] == 1 && !empty($checkUser)){
    $result = [
      'code' => 2,
    ];
    return $result;
  }

  //3：活动为老用户领取，而领取的用户是新用户
  if($activity['user_type']==2 && empty($checkUser)){
    $result = [
      'code' => 3,
    ];
    return $result;
  }


  //4：优惠券是否领取完
  $coupon = $this->getCouponExpire($collection_coupon,$params['mobile']); //这里提示有一个优惠券列表，根据自己的业务需求做，这个方法就不贴了
  //return $coupon;
  if($coupon == 1){
    $result = [
      'code' => 4,
    ];
    return $result;
  }

  //5：已领取过优惠券提示
  $userCoupon = '';
  $userRate = '';
  if(!empty($checkUser)){
    //user存在则为老用户，再检查是否领取过
    $userCoupon = $this->getUserCoupon($collection_coupon,$checkUser['user_id']);
    $userRate = $this->getUserCouponRate($checkUser['user_id'],$activity['activity_id']);
  }else{
    //新用户，检查是否注册过
    $var_user = UserBaseModel::where('user_name',$params['mobile'])->first();
    if(!empty($var_user)){
      $userCoupon = $this->getUserCoupon($collection_coupon,$var_user['user_id']);
      $userRate = $this->getUserCouponRate($var_user['user_id'],$activity['activity_id']);
    }
  }

  //return $userRate;

  if($userCoupon == 1){
    $result = [
      'code' => 5,
      'phone'=> $str_mobile,
      'coupon' => $userRate,
      'is_get' => false,
    ];
    return $result;
  }

  //5：领取成功
  //如果活动规定是新老用户0，新用户1，老用户2
  $getCouponSuccess = $this->getCouponSuccess($activity['user_type'],$checkUser,$collection_coupon,$params['mobile']);
  //return $getCouponSuccess;
  if($getCouponSuccess['status'] == 200){
    $result = [
      'code' => 5,
      'phone'=> $str_mobile,
      'coupon' => $getCouponSuccess['result'][0],
      'is_get' => true,
    ];
    return $result;
  }


}

/**
 * Function:用户领取活动
 * Author:cyw0413
 * @param $user_type
 */
public function getCouponSuccess($user_type,$user,$coupon,$mobile)
{
  if(count($coupon) > 0){

    switch ($user_type){
      case 1:
        //新用户领取，如果从来没注册过就要新增用户
        $res = $this->addUser($mobile,$coupon); 
        return [
          'result' => $res,
          'status' => 200
        ];
        break;
      case 2:
        //老用户领取
        $res = $this->insertUserCoupon($user,$coupon);
        return [
          'result' => $res,
          'status' => 200
        ];
        break;
      default:
        //新老用户领取,判断是新用户还是老用户,这里的$user是有无配送单，有则为老用户；
        if(empty($user)){
          $res = $this->addUser($mobile,$coupon);
        }else{

          $res = $this->insertUserCoupon($user,$coupon); //老用户，直接发放优惠券
        }
        return [
          'result' => $res,
          'status' => 200
        ];
        break;
    }
  }else{
    throw new \Exception("优惠券不存在或者已经停用");
  }


}

/**
 * Function:发放优惠券
 * Author:cyw0413
 * @param $user
 * @param $coupon
 */
public function insertUserCoupon($user,$coupon)
{
  $relate = [];
  foreach($coupon as $item){

    $res = CouponConfigSendBaseModel::where([
      'config_id'=>$item['config_id'],
      'status'  => 0,
    ])->first();

    if(empty($res) || (!empty($res) && $res['is_send'] == 0) ){
      throw new \Exception("优惠券未发放,暂不可领取");
    }

    //发放优惠券，有多少张就添加多少张，这里扣除优惠券时，主要用不同的coupon_sn来区别
    $onlyCoupon = $this->getCouponName($item['config_id']);
    if ($onlyCoupon['expire_type'] == 0) {
      $start_time = $onlyCoupon['expire_start_time'];
      $end_time = $onlyCoupon['expire_end_time'];
    } else {
      $start_time = date('Y-m-d H:i:s');
      $end_time = date('Y-m-d H:i:s', time()+86400*$onlyCoupon['expire_type']);
    }

    $result = [
      'user_id'  => $user['user_id'],
      'config_id' => $item['config_id'],
      'name'   => $onlyCoupon['name'],
      'get_type' => $onlyCoupon['get_type'],
      'amount'  => $onlyCoupon['amount'],
      'require_price' => $onlyCoupon['require_price'],
      'status'    => 1,
      'start_time'  => $start_time,
      'end_time'   => $end_time,
    ];
    for($i=0; $i < $item['quantity'];$i++){
      $result['coupon_sn'] = 'B'.mt_rand(1, 10000) . strtoupper(uniqid(mt_rand(1, 10000)));
      $userCoupon = UserCouponBaseModel::create($result);
    }

    //扣除相应的优惠券数量,这里用到了锁表，防止并发时，优惠券为-1
    $couponConfig = CouponConfigBaseModel::where('config_id',$item['config_id'])->lockForUpdate()->first();
    if($couponConfig->left_quantity > 0 ){
      if($couponConfig->left_quantity >= $item['quantity']){
        $couponConfig->left_quantity = $couponConfig->left_quantity-$item['quantity'];
        $couponConfig->save();
      }else{
        throw new \Exception("优惠券剩余数量不够扣减");
      }

    }


    $relate = [
      'coupon_id' => $userCoupon->coupon_id,
      'user_id'  => $user['user_id'],
      'config_id' => $item['config_id'],
      'activity_id' => $item['activity_id']
    ];

    ActivityCouponUserRelateBaseModel::create($relate);

    $relate[] = $this->getUserCouponRate($user['user_id'],$item['activity_id']);


  }

  return $relate;
}