根据自己的业务需求，用PHP做一个优惠券活动

/**
 * Function:优惠券领取处理
 * Author:磊丰
 * @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:磊丰
 * @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;
}