<?php /**拼多多砍价算法 * Created by PhpStorm. * Website
//www.youhuajun.com * User: Benjamin * Date: 2019/9/6 * Time: 9:15 */ class Pinduoduo { /**计算本次折扣金额 * @param $price商品单价 * @param $currentPrice当前商品价格，即折扣后的价格 * @param $followerCount当前拉新人数 * @param $needCount所需拉新人数 * @param $willSucess是否给钱，默认是给钱，不给钱永远砍价不到 */ public function caculateDiscountAmount($price,$currentPrice,$followerCount,$needCount,$isNewFollower=false,$willSucess=true){ if($isNewFollower==false){ $followerCount = $followerCount+1; } $rate = $currentPrice/$price; switch($rate){ case 0.2 <= $rate && $rate<=1: $averageMoney = $followerCount/$needCount; $discountMoney = $this->makeDiscountAmount($currentPrice,$averageMoney); break; case 0 <= $rate && $rate<0.2: $averageMoney = $followerCount/$needCount; //接近价格，但是没有满足人数，直接返回0元 if($averageMoney <= ‘0.01‘&&$followerCount < $needCount){ $discountMoney = ‘0.00‘; break; } $discountMoney = $this->makeDiscountAmount($currentPrice,$averageMoney); //不给商品的，永远无法达到条件 if($willSucess==false){ if(($currentPrice-$discountMoney)<=0){ $discountMoney = ‘0.00‘; } break; } if($isNewFollower==false){ $discountMoney = sprintf("%.2f",$discountMoney/5); if($averageMoney<0.5){ $discountMoney = sprintf("%.2f",$discountMoney/20); } } break; default: $discountMoney = ‘0.00‘; } return $discountMoney; } /**计算指定条件砍价金额 * @param $currentPrice当前价格 * @param $averageMoney平均折扣 * @param int $step * @return float */ private function makeDiscountAmount($currentPrice,$averageMoney,$step=5){ $discountMoney = $currentPrice/$step; if($discountMoney>$averageMoney){ $this->makeDiscountAmount($currentPrice,$step=1); }