WeChat applet uses PHP to implement payment function

This article mainly introduces relevant information on the detailed explanation of PHP examples for the payment function of WeChat mini program. Friends in need can refer to the following

Detailed explanation of PHP examples for the payment function of WeChat mini program

Front-end code:

 wx.request({
    url: 'https://www.yourhost.com/weixin/WeiActivity/payJoinfee',//改成你自己的链接
    header: {
      'Content-Type': 'application/x-www-form-urlencoded'
    },
    method:'POST',
    success: function(res) {
      console.log(res.data);
      console.log('调起支付');
      wx.requestPayment({
        'timeStamp': res.data.timeStamp,
        'nonceStr': res.data.nonceStr,
        'package': res.data.package,
        'signType': 'MD5',
        'paySign': res.data.paySign,
        'success':function(res){
          console.log('success');
          wx.showToast({
            title: '支付成功',
            icon: 'success',
            duration: 3000
          });
        },
        'fail':function(res){
          console.log('fail');
        },
        'complete':function(res){
          console.log('complete');
        }
      });
    },
    fail:function(res){
      console.log(res.data)
    }
  });

Back-end code:

//支付费用
 public function payJoinfee(){
 $appid='wx888888888';
 $openid='oCQwY0Q_pzrQpu8888888';
 $mch_id='141388888';
 $key='9A0A86888888888';
 
 import('Weixin.Lib.WeixinPay');
 $weixinpay = new \WeixinPay($appid,$openid,$mch_id,$key);
 $return=$weixinpay->pay();

 $this->response($return,'json');
 }

WeChat payment class

<?php
/*
 * 小程序微信支付
 */
class WeixinPay{
 protected $appid;
 protected $mch_id;
 protected $key;
 protected $openid;
 function __construct($appid,$openid,$mch_id,$key){
 $this->appid=$appid;
 $this->openid=$openid;
 $this->mch_id=$mch_id;
 $this->key=$key;
 } 
 public function pay(){
 //统一下单接口
 $return=$this->weixinapp();
 return $return;
 }
 //统一下单接口
 private function unifiedorder(){
 $url=&#39;https://api.mch.weixin.qq.com/pay/unifiedorder&#39;;
 $parameters=array(
  &#39;appid&#39;=>$this->appid,//小程序ID
  &#39;mch_id&#39;=>$this->mch_id,//商户号
  &#39;nonce_str&#39;=>$this->createNoncestr(),//随机字符串
  &#39;body&#39;=>&#39;测试&#39;,//商品描述
  &#39;out_trade_no&#39;=>&#39;2015450806125346&#39;,//商户订单号
  &#39;total_fee&#39;=>floatval(0.01*100),//总金额 单位 分
  &#39;spbill_create_ip&#39;=>$_SERVER[&#39;REMOTE_ADDR&#39;],//终端IP
  &#39;notify_url&#39;=>&#39;http://www.weixin.qq.com/wxpay/pay.php&#39;,//通知地址
  &#39;openid&#39;=>$this->openid,//用户id
  &#39;trade_type&#39;=>&#39;JSAPI&#39;//交易类型
 );
 //统一下单签名
 $parameters[&#39;sign&#39;]=$this->getSign($parameters);
 $xmlData=arrayToXml($parameters);
 
 $return=xmlToArray(postXmlSSLCurl($xmlData,$url,60));
 
 return $return;
 }
 //微信小程序接口
 private function weixinapp(){
 //统一下单接口
 $unifiedorder=$this->unifiedorder();
 
 $parameters=array(
  &#39;appId&#39;=>$this->appid,//小程序ID
  &#39;timeStamp&#39;=>&#39;&#39;.time().&#39;&#39;,//时间戳
  &#39;nonceStr&#39;=>$this->createNoncestr(),//随机串
  &#39;package&#39;=>&#39;prepay_id=&#39;.$unifiedorder[&#39;prepay_id&#39;],//数据包
  &#39;signType&#39;=>&#39;MD5&#39;//签名方式
 );
 //签名
 $parameters[&#39;paySign&#39;]=$this->getSign($parameters);
 
 return $parameters;
 }
 //作用：产生随机字符串，不长于32位
 private function createNoncestr($length = 32 ){
 $chars = "abcdefghijklmnopqrstuvwxyz0123456789"; 
 $str ="";
 for ( $i = 0; $i < $length; $i++ ) { 
  $str.= substr($chars, mt_rand(0, strlen($chars)-1), 1); 
 } 
 return $str;
 }
 //作用：生成签名
 private function getSign($Obj){
 foreach ($Obj as $k => $v){
  $Parameters[$k] = $v;
 }
 //签名步骤一：按字典序排序参数
 ksort($Parameters);
 $String = $this->formatBizQueryParaMap($Parameters, false);
 //签名步骤二：在string后加入KEY
 $String = $String."&key=".$this->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 $result_;
 }
 ///作用：格式化参数，签名过程需要使用
 private function formatBizQueryParaMap($paraMap, $urlencode){
 $buff = "";
 ksort($paraMap);
 foreach ($paraMap as $k => $v){
   if($urlencode)
   {
   $v = urlencode($v);
  }
  $buff .= $k . "=" . $v . "&";
 }
 $reqPar;
 if (strlen($buff) > 0){
  $reqPar = substr($buff, 0, strlen($buff)-1);
 }
 return $reqPar;
 }
}

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