PHP微信小程序支付工具类封装 微信小程序支付流程小程序登录，获取openid后端调用微信支付统一下单得到预支付交易会话标识prepay_id组装小程序支付所需的几个参数，并进行签名支付成功，主动查询订单支付状态接收微信支付回调通知微信小程序支付<?php /** * 微信小程序支付 * @author Stephen */ namespace App\Helper\Pay; use GuzzleHttp\Client; class WxApp { private $app_id; private $secret; private $mch_id; private $wx_pay_url = 'https://api.mch.weixin.qq.com'; private $pay_uri = '/pay/unifiedorder'; private $order_query_uri = '/pay/orderquery'; public function __construct() { $this->app_id = 'app_id'; $this->secret = 'secret'; $this->mch_id = 'mch_id'; } /** * 下单 * @param float $totalFee * @param string $orderNo * @param string $orderName * @param string $notifyUrl * @param string $openId * @return array * @throws \GuzzleHttp\Exception\GuzzleException|\Exception */ public function pay(float $totalFee, string $orderNo, string $orderName, string $notifyUrl, string $openId) : array { $data = [ 'appid' => $this->app_id, 'mch_id' => $this->mch_id, 'nonce_str' => $this->generateNonceStr(), 'sign_type' => 'MD5', 'body' => $orderName, 'out_trade_no' => $orderNo, 'fee_type' => 'CNY', 'total_fee' => intval($totalFee * 100), // 单位：分 'spbill_create_ip' => request()->getClientIp(), 'time_start' => date('YmdHis'), 'notify_url' => $notifyUrl, 'trade_type' => 'JSAPI', 'openid' => $openId ]; $data['sign'] = $this->generateSignature($data); $payXmlStr = $this->arrayToXml($data); $unifiedOrder = $this->request($this->pay_uri, $payXmlStr); if (!$unifiedOrder) { throw new \Exception('支付请求失败'); } if ($unifiedOrder['return_code'] != 'SUCCESS') { throw new \Exception($unifiedOrder['return_msg'] ?? '支付请求失败'); } if ($unifiedOrder['result_code'] != 'SUCCESS') { throw new \Exception($unifiedOrder['err_code'] ?? '支付请求失败'); } return $this->getWxPayData($unifiedOrder); } /** * 回调 * @return string * @throws \Exception */ public function notify($notify) { if (!$notify) { throw new \Exception('Parse XML Error'); } if ($notify['return_code'] != 'SUCCESS') { throw new \Exception($notify['return_msg'])); } if ($notify['result_code'] != 'SUCCESS') { throw new \Exception($notify['err_code'])); } //签名验证 $signature = $notify['sign']; $array = (array)$notify; unset($array['sign']); if ($signature != $this->generateSignature($array)) { throw new \Exception('签名验证失败'); } return '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>'; } /** * 查询订单 * @param string $orderNo * @param string $wxOrderNo * @return \SimpleXMLElement * @throws \GuzzleHttp\Exception\GuzzleException */ public function query(string $orderNo, ?string $wxOrderNo='') { $data = [ 'appid' => $this->app_id, 'mch_id' => $this->mch_id, 'out_trade_no' => $orderNo, 'nonce_str' => $this->generateNonceStr(), 'sign_type' => 'MD5' ]; $wxOrderNo && $data['transaction_id'] = $wxOrderNo; $data['sign'] = $this->generateSignature($data); $payXmlStr = $this->arrayToXml($data); $unifiedOrder = $this->request($this->order_query_uri, $payXmlStr); if (!$unifiedOrder) { throw new \Exception('订单查询失败'); } if ($unifiedOrder['return_code'] != 'SUCCESS') { throw new \Exception($unifiedOrder['return_msg'] ?? '订单查询失败'); } if ($unifiedOrder['result_code'] != 'SUCCESS') { throw new \Exception($unifiedOrder['err_code'] ?? '订单查询失败'); } return $unifiedOrder; } /** * 生成随机字符串 * @param int|null $length * @return string */ private function generateNonceStr(?int $length = 16) { $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'; $str = ''; for ($i = 0; $i < $length; $i++) { $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1); } return $str; } /** * 生成签名 * @param array $params * @return string */ private function generateSignature(array $params) { ksort($params, SORT_STRING); $formatStr = $this->formatQueryStr($params); return strtoupper(md5($formatStr)); } private function formatQueryStr(array $params) { $formatStr = ""; foreach ($params as $key => $val) { $formatStr .= "{$key}={$val}&"; } return $formatStr."key=".$this->secret; } private function arrayToXml(array $params) { $xml = "<xml>"; foreach ($params as $key => $val) { if (is_numeric($val)) { $xml .= "<" . $key . ">" . $val . "</" . $key . ">"; } else $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">"; } $xml .= "</xml>"; return $xml; } /** * 微信小程序调用微信支付的参数 * @param $unifiedOrder * @return array */ private function getWxPayData($unifiedOrder) : array { $data = [ 'appId' => $this->app_id, 'timeStamp' => time(), 'nonceStr' => $this->generateNonceStr(), 'package' => "prepay_id=" . $unifiedOrder['prepay_id'], 'signType' => 'MD5' ]; $data['paySign'] = $this->generateSignature($data); return $data; } /** * 微信支付请求 * @param string $url * @param string|null $method * @param string|null $body * @return null|\SimpleXMLElement * @throws \GuzzleHttp\Exception\GuzzleException */ private function request(string $url, string $params) { $url = $this->wx_pay_url . $url; $client = new Client(['verify' => false]); $response = $client->request('POST', $url, [ 'body' => $body ]); $code = $response->getStatusCode(); if ($code === 200) { $content = $response->getBody()->getContents(); return simplexml_load_string($content, 'SimpleXMLElement', LIBXML_NOCDATA); } return null; } }发起支付请求$totalPrice = 100; //总金额，单位：元 $orderNo = date('Ymd') . rand(10000, 99999); // 订单号 $proName = '产品名称'; $callback = 'https://xx.com/pay/wxapp/callback'; // 支付成功后回调Url $openId = ''; // OPEN ID $wxAppPay = new App\Helper\Pay\WxApp(); // 将支付请求参数直接返回给前端，前端再到微信发起支付请求 return $wxAppPay->pay($totalPrice, $orderNo, $proName, $callback, $openId);支付完成，主动查询订单支付状态$orderNo = $_POST['order_no']; $wxAppPay = new App\Helper\Pay\WxApp(); $response = $wxAppPay->query($orderNo); if ($response['trade_state'] === 'SUCCESS') { // todo 支付成功，修改订单状态 }支付回调$post = file_get_contents('php://input'); $notify = simplexml_load_string($post, 'SimpleXMLElement', LIBXML_NOCDATA); $totalFee = $notify['total_fee']; // 总金额 $cashFee = $notify['cash_fee']; // 支付金额 $outOrderId = $notify['transaction_id']; // 微信订单号 $orderId = $notify['out_trade_no']; // 订单号 $paymentTime = $notify['time_end']; // 完成支付时间 // 回调验签 $wxAppPay = new App\Helper\Pay\WxApp(); $response = $wxAppPay->notify($notify); // todo 完成支付，处理订单