微信小程序 wx.requestPayment({}) 唤起微信支付

作者：辰风沐阳阅读：1547 发布时间：2020-12-18 上次更新：2021-05-27

#### 1. 登录商户平台，将商户和小程序进行关联
---

在 `产品中心` 中的 `APPID账号管理` 中，添加关联的小程序 `appid`

![](https://img.itqaq.com/art/content/46f28aaf496fc53046d16706cf406e28.png)

#### 2. 小程序调起支付API
---

小程序调起支付API：[https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=7_7&index=5](https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=7_7&index=5)

小程序API开发文档：[https://developers.weixin.qq.com/miniprogram/dev/api/api-pay.html#wxrequestpaymentobject](https://developers.weixin.qq.com/miniprogram/dev/api/api-pay.html#wxrequestpaymentobject)

#### 3. 封装类
---

```php
<?php

class Wechat
{
	// 公众号的或者小程序支付参数
	private $appId     = "wx5117bexxxxxx";
	private $appSecret = "136ae3xxxxxxx";
	// 微信商户号
	private $mch_id    = "15xxxx";
	private $mch_key   = "xxxasdfghjkxxxxxx";

// 回调地址
	public $notify_url = '';
	// 退款回掉地址
	public $refund_notify_url = '';
	private $request;
	private $nonce_str;

public function __construct()
	{
		$this->request = request();
		$this->notify_url = 'notice.php';
		$this->refund_notify_url = 'refund.php';
		$this->nonce_str = md5(date('YmdHis') . time() . rand(1000, 9999));
	}

//小程序登录

/**
	 * @param $code  获取微信支付的登录code
	 * @return mixed
	 */
	public function wxLogin($code)
	{
		$url = "https://api.weixin.qq.com/sns/jscode2session?appid=" . $this->appId . "&secret=" . $this->appSecret . "&js_code=" . $code . "&grant_type=authorization_code";
		return json_decode($this->execute($url), true);
	}

/**
	 * @param $out_trade_no  微信支付唯一订单
	 * @param $openid 微信支付用户的openid
	 * @param $price  订单支付的价格,(单位,元)
	 * @param string $desc 订单描述
	 * @return array|mixed 组装支付参数
	 */
	public function getPayParameter($out_trade_no, $openid, $price, $desc = '')
	{
		header("Content-type:text/html;charset=utf-8"); //此处进行字符集初始化，
		$data = [
			'appid'            => $this->appId,
			'body'             => $desc,
			'mch_id'           => $this->mch_id,
			'nonce_str'        => $this->nonce_str,// 随机字符串
			'notify_url'       => $this->notify_url,//异步回调地址
			'openid'           => $openid,//用户登录时获取的code中含有的值
			'out_trade_no'     => $out_trade_no,//商家订单号
			'spbill_create_ip' => $this->get_real_ip(),//APP和网页支付提交用户端ip
			'total_fee'        => $price * 100,//订单总额,单位:分
			'attach'           => 'order',//确定是哪个商家进行的支付
			'trade_type'       => 'JSAPI'//交易类型
		];
		//将数组转化为Xml
		$data['sign'] = $this->makeSign($data);
		$abc_xml = $this->arrayToXml($data);
		//统一下单接口prepay_id
		$url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
		$xml = $this->execute($url, $abc_xml, 1);
		//将XMl转化为数组
		$info = $this->xml2array($xml);
		if (!isset($info['prepay_id'])) {
			return $info;
		}
		$params = array(
			'appId'     => $this->appId,
			'nonceStr'  => $data['nonce_str'],
			'package'   => 'prepay_id=' . $info['prepay_id'],
			'signType'  => 'MD5',
			'timeStamp' => '' . time(),
		);
		$_info['paySign']    = $this->makeSign($params);
		$_info['timeStamp']  = "" . $params['timeStamp'];
		$_info['nonceStr']   = $params['nonceStr'];
		$_info['package']    = $params['package'];
		$_info['signType']   = $params['signType'];
		$_info['notify_url'] = $this->notify_url;

// 请求成功后进行返回数据信息
		if ($info['return_code'] == 'SUCCESS' || $info['result_code'] == 'SUCCESS') {
			return $_info;
		} else {
			return [];
		}
	}

/**
	 * @param $openid  支付的用户的openid
	 * @return mixed
	 */
	public function userInfo($openid)
	{
		$token = $this->getWxAccessToken();
		$url = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=" . $token . "&openid=$openid&lang=zh_CN";
		return json_decode($this->execute($url), true);
	}

//获取微信的token
	public function getWxAccessToken()
	{
		$key = $this->appId . 'miniProgram_access_token';
		$accessToken = Cache::get($key);
		if ($accessToken) return $accessToken;
		$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" . $this->appId . "&secret=" . $this->appSecret;
		$con = json_decode($this->execute($url));
		Cache::set($key, $con->access_token, $con->expires_in);
		return $con->access_token;
	}

/**
	 * @param $url  请求url地址
	 * @param string $data 请求参数
	 * @param int $post 是否为post
	 * @param int $cert 是否为微信的cert
	 * @return mixed
	 */
	public function execute($url, $data = '', $post = 0, $cert = 0)
	{
		if (is_array($data)) {
			$data = json_encode($data);
		}
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_HEADER, 0);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 3);
		curl_setopt($ch, CURLOPT_POST, $post);
		if ($post)
			curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
		if ($cert) {
			curl_setopt($ch, CURLOPT_SSLCERT, WEB_PATH . 'cert' . DS . 'apiclient_cert.pem');
			curl_setopt($ch, CURLOPT_SSLKEY, WEB_PATH . 'cert' . DS . 'apiclient_key.pem');
		}
		// curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type:application/json']);
		curl_setopt($ch, CURLOPT_URL, $url);
		$result = curl_exec($ch);
		curl_close($ch);
		return $result;
	}

ob_start();
		curl_exec($ch);
		$return_content = ob_get_contents();
		ob_end_clean();
		$return_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
		if ($is_array) {
			if (!is_array($return_content)) {
				$return_content = json_decode($return_content, true);
			}
		}
		return $return_content;
	}

// 数组转化为 xlm
	public function arrayToXml($data)
	{
		$data['sign'] = $this->makeSign($data);
		ksort($data);
		//进行拼接数据
		$abc_xml = "<xml>";
		foreach ($data as $key => $val) {
			if (is_numeric($val)) {
				$abc_xml .= "<" . $key . ">" . $val . "</" . $key . ">";
			} else {
				$abc_xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
			}
		}
		$abc_xml .= "</xml>";
		return $abc_xml;
	}

//xlm 转化为数组
	public function xml2array($xml)
	{
		if (empty($xml)) {
			return array();
		}
		//禁止引用外部xml实体
		libxml_disable_entity_loader(true);
		$xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
		$val = json_decode(json_encode($xmlstring), true);
		return $val;
	}

//微信进行拼接sign
	public function makeSign($params)
	{
		//签名步骤一：按字典序排序数组参数
		ksort($params);
		$buff1 = '';
		foreach ($params as $k => $v) {
			if ($k != "sign" && $v != "" && !is_array($v)) {
				$buff1 .= $k . "=" . $v . "&";
			}
		}
		$buff1 = trim($buff1, "&");
		//签名步骤二：在string后加入KEY
		$string = $buff1 . "&key=" . $this->mch_key;
		//签名步骤三：MD5加密
		$string = md5($string);
		//签名步骤四：所有字符转为大写
		$result = strtoupper($string);
		return $result;
	}

//验证图片或者视频是否涉黄
	public function imgSecCheck($media_url, $media_type = 2)
	{
		$url = 'https://api.weixin.qq.com/wxa/media_check_async?access_token=' . $this->getWxAccessToken();
		$return = $this->execute($url, [
			'media_url' => $media_url,
			'media_type' => $media_type,
		], 1);
		$return = json_decode($return, true);
		if ($return && $return['errcode'] == 0) {
			return true;
		}
		return false;
	}

//验证发布内容是否违法以及敏感词汇
	public function msgSecCheck($content = '')
	{
		$url = 'https://api.weixin.qq.com/wxa/msg_sec_check?access_token=' . $this->getWxAccessToken();
		$return = $this->execute($url, ['content' => $content], 1);
		$return = json_decode($return, true);
		if ($return && $return['errcode'] == 0) {
			return true;
		}
		return false;
	}

/**
	 * [sendMoney 企业付款到零钱]
	 * @param  [type] $amount     [发送的金额（分）目前发送金额不能少于1元]
	 * @param  [type] $re_openid  [发送人的 openid]
	 * @param  string $desc [企业付款描述信息 (必填)]
	 * @param  string $check_name [收款用户姓名 (选填)]
	 * @return [type]             [description]
	 * https://www.cnblogs.com/echoppy/p/8603286.html
	 */
	public function sendMoney($amount, $re_openid)
	{

$total_amount = (100) * $amount;
		$data = array(
			'mch_appid' => $this->appId,//商户账号appid
			'mchid' => $this->mch_id,//商户号
			'nonce_str' => $this->nonce_str,//随机字符串
			'partner_trade_no' => date('YmdHis') . rand(1000, 9999),//商户订单号
			'openid' => $re_openid,//用户openid
			'check_name' => 'NO_CHECK',//校验用户姓名选项,
			'amount' => $total_amount,//付款金额，单位为分
			'desc' => '商户提现',//企业付款描述信息
			'spbill_create_ip' => $this->get_real_ip(),//Ip地址
		);

$xml = $this->arraytoxml($data);
		$url = 'https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers'; //调用接口
		//$res = $this->http_post_data($url, $xml)
		$res = $this->execute($url, $xml, 1, 1);
		$return = $this->xml2array($res);
		return $return;
	}

/**
	 * @param $amount  退款金额
	 * @param $re_openid  退款用户的openid
	 * @return bool  退款成功失败
	 * 开发文档 https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_4
	 */
	public function refundUserMoney($transaction_id, $total_fee, $refund_fee, $out_refund_no)
	{
		$data = array(
			'appid' => $this->appId,//商户账号appid
			'mch_id' => $this->mch_id,//商户号
			'nonce_str' => $this->nonce_str,//随机字符串
			'transaction_id' => $transaction_id,//微信支付商户号
			'total_fee' => $total_fee * 100,//订单金额
			'refund_fee' => $refund_fee * 100,//退款金额
			'notify_url' => $this->refund_notify_url,//退款金额
			'out_refund_no' => $out_refund_no,//退款金额
		);

//生成签名算法
		$secrect_key = $this->mch_key;   ///这个就是个API密码。MD5 32位。
		$data = array_filter($data);
		ksort($data);
		$str = '';
		foreach ($data as $k => $v) {
			$str .= $k . '=' . $v . '&';
		}
		$str .= 'key=' . $secrect_key;
		$data['sign'] = md5($str);
		//生成签名算法
		$xml = $this->arraytoxml($data);
		$url = "https://api.mch.weixin.qq.com/secapi/pay/refund";
		$res = $this->execute($url, $xml, 1, 1);
		if (!$res) {
			return false;
		}
		//$res = $this->http_post_data($url, $xml);
		$return = $this->xml2array($res);
		if ($return['return_code'] == 'SUCCESS') {
			return true;
		}
		return false;
	}

/**
	 * 获取客户端IP
	 */
	public function get_real_ip()
	{
		$ip = $_SERVER['REMOTE_ADDR'];
		if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && preg_match_all('#\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) {
			foreach ($matches[0] AS $xip) {
				if (!preg_match('#^(10|172\.16|192\.168)\.#', $xip)) {
					$ip = $xip;
					break;
				}
			}
		} elseif (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}\.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) {
			$ip = $_SERVER['HTTP_CLIENT_IP'];
		} elseif (isset($_SERVER['HTTP_CF_CONNECTING_IP']) && preg_match('/^([0-9]{1,3}\.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CF_CONNECTING_IP'])) {
			$ip = $_SERVER['HTTP_CF_CONNECTING_IP'];
		} elseif (isset($_SERVER['HTTP_X_REAL_IP']) && preg_match('/^([0-9]{1,3}\.){3}[0-9]{1,3}$/', $_SERVER['HTTP_X_REAL_IP'])) {
			$ip = $_SERVER['HTTP_X_REAL_IP'];
		}
		return $ip ? $ip : '127.0.0.1';
	}
}
```

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