Nowadays, using APP WeChat payment has become the mainstream payment mode. Below, the editor will introduce to you an example explanation of how to implement APP WeChat payment through PHP. , it is simple and easy to learn. Let’s learn APP with the editor Pay with WeChat.

1. The PHP background generates a prepayment transaction order, returns the correct prepayment transaction response ID, and then calls up the payment in the APP!

Official document:https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_1

Spliced ??according to the document The parameters required by WeChat need several methods. Just upload the code!

The parameters transmitted to WeChat must be assembled into xml format and sent as parameter array!

public function ToXml($data=array())
 {
 if(!is_array($data) || count($data) <= 0)
 {
  return &#39;數(shù)組異常&#39;;
 }
 $xml = "<xml>";
 foreach ($data as $key=>$val)
 {
  if (is_numeric($val)){
  $xml.="<".$key.">".$val."</".$key.">";
  }else{
  $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
  }
 }
 $xml.="</xml>";
 return $xml;
 }

2. Generate random characters String, the parameters required by WeChat! There are many methods here, it depends on your hobbies!

function rand_code(){
 $str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';//62個字符
 $str = str_shuffle($str);
 $str = substr($str,0,32);
 return $str;
}

3. This is an important step for WeChat, this method will be used many times! Generate signature

private function getSign($params) {
 ksort($params); //將參數(shù)數(shù)組按照參數(shù)名ASCII碼從小到大排序
 foreach ($params as $key => $item) {
  if (!empty($item)) {  //剔除參數(shù)值為空的參數(shù)
  $newArr[] = $key.'='.$item; // 整合新的參數(shù)數(shù)組
  }
 }
 $stringA = implode("&", $newArr);  //使用 & 符號連接參數(shù)
 $stringSignTemp = $stringA."&key="."************************"; //拼接key
 // key是在商戶平臺API安全里自己設置的
 $stringSignTemp = MD5($stringSignTemp); //將字符串進行MD5加密
 $sign = strtoupper($stringSignTemp); //將所有字符轉換為大寫
 return $sign;
 }

4. Pass the parameters to WeChat and generate a pre-payment order! Receive the data returned by WeChat and send it back to the APP. The APP calls the payment interface to complete the payment! For the parameters required on the APP, please see the WeChat documentation: https://pay. weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_12&index=2

public function wx_pay() {
 $nonce_str = $this->rand_code(); //調(diào)用隨機字符串生成方法獲取隨機字符串
 $data['appid'] ='wxdbc5dc*******'; //appid
 $data['mch_id'] = '1493*****' ; //商戶號
 $data['body'] = "APP支付測試";
 $data['spbill_create_ip'] = $_SERVER['HTTP_HOST']; //ip地址
 $data['total_fee'] = 1;    //金額
 $data['out_trade_no'] = time().mt_rand(10000,99999); //商戶訂單號,不能重復
 $data['nonce_str'] = $nonce_str;   //隨機字符串
 $data['notify_url'] = 'http://xxx.xxx.com/wx_notify'; //回調(diào)地址,用戶接收支付后的通知,必須為能直接訪問的網(wǎng)址,不能跟參數(shù)
 $data['trade_type'] = 'APP'; //支付方式
 //將參與簽名的數(shù)據(jù)保存到數(shù)組 注意：以上幾個參數(shù)是追加到$data中的，$data中應該同時包含開發(fā)文檔中要求必填的剔除sign以外的所有數(shù)據(jù)
 $data['sign'] = $this->getSign($data); //獲取簽名
 $xml = $this->ToXml($data);  //數(shù)組轉xml
 //curl 傳遞給微信方
 $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
 //header("Content-type:text/xml");
 $ch = curl_init();
 curl_setopt($ch,CURLOPT_URL, $url);
 if(stripos($url,"https://")!==FALSE){
  curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
 } else {
  curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,TRUE);
  curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);//嚴格校驗
 }
 //設置header
 curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
 curl_setopt($ch, CURLOPT_HEADER, FALSE);
 //要求結果為字符串且輸出到屏幕上
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
 //設置超時
 curl_setopt($ch, CURLOPT_TIMEOUT, 30);
 curl_setopt($ch, CURLOPT_POST, TRUE);
 //傳輸文件
 curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
 //運行curl
 $data = curl_exec($ch);
 //返回結果
 if($data){
  curl_close($ch);
  //返回成功,將xml數(shù)據(jù)轉換為數(shù)組.
  $re = $this->FromXml($data);
  if($re['return_code'] != 'SUCCESS'){
  json("201",'簽名失敗');
  }
  else{
  //接收微信返回的數(shù)據(jù),傳給APP!
  $arr =array(
   'prepayid' =>$re['prepay_id'],
   'appid' => 'wxdbc5dc*****',
   'partnerid' => '14937****',
   'package' => 'Sign=WXPay',
   'noncestr' => $nonce_str,
   'timestamp' =>time(),
  );
  //第二次生成簽名
  $sign = $this->getSign($arr);
  $arr['sign'] = $sign;
  json('200','簽名成功',$arr);
  }
 } else {
  $error = curl_errno($ch);
  curl_close($ch);
  json('201',"curl出錯，錯誤碼:$error");
 }
 }

5. Convert xml data into an array, used when receiving data returned by WeChat.

public function FromXml($xml)
 {
 if(!$xml){
  echo "xml數(shù)據(jù)異常！";
 }
 //將XML轉為array
 //禁止引用外部xml實體
 libxml_disable_entity_loader(true);
 $data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
 return $data;
 }

2. After the APP payment is successful, it will call the callback address you filled in.

For details of the return parameters, please refer to the WeChat documentation: https://pay. weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_7&index=3

// 微信支付回調(diào)
 function wx_notify(){
  //接收微信返回的數(shù)據(jù)數(shù)據(jù),返回的xml格式
  $xmlData = file_get_contents('php://input');
  //將xml格式轉換為數(shù)組
  $data = $this->FromXml($xmlData);
  //用日志記錄檢查數(shù)據(jù)是否接受成功，驗證成功一次之后，可刪除。
  $file = fopen('./log.txt', 'a+');
  fwrite($file,var_export($data,true));
  //為了防止假數(shù)據(jù)，驗證簽名是否和返回的一樣。
  //記錄一下，返回回來的簽名，生成簽名的時候，必須剔除sign字段。
  $sign = $data['sign'];
  unset($data['sign']);
  if($sign == $this->getSign($data)){
  //簽名驗證成功后，判斷返回微信返回的
  if ($data['result_code'] == 'SUCCESS') {
  //根據(jù)返回的訂單號做業(yè)務邏輯
  $arr = array(
   'pay_status' => 1,
   );
  $re = M('order')->where(['order_sn'=>$data['out_trade_no']])->save($arr);
  //處理完成之后，告訴微信成功結果！
  if($re){
   echo &#39;<xml>
  <return_code><![CDATA[SUCCESS]]></return_code>
  <return_msg><![CDATA[OK]]></return_msg>
  </xml>&#39;;exit();
  }
  }
  //支付失敗，輸出錯誤信息
  else{
  $file = fopen(&#39;./log.txt&#39;, &#39;a+&#39;);
  fwrite($file,"錯誤信息：".$data[&#39;return_msg&#39;].date("Y-m-d H:i:s"),time()."\r\n"); 
  }
 }
 else{
  $file = fopen(&#39;./log.txt&#39;, &#39;a+&#39;);
  fwrite($file,"錯誤信息：簽名驗證失敗".date("Y-m-d H:i:s"),time()."\r\n"); 
  }
}

Here, the WeChat APP payment process is completed successfully! Thank you for your support!

The above is the specific method of implementing APP WeChat payment in PHP. Through the editor's example explanation, I believe everyone has mastered it.

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