PHP implementation of APP WeChat payment examples, app examples

Example of APP payment implementation in PHP, and description of app instances

I. the PHP background generates a pre-payment transaction ticket, returns the correct pre-payment transaction session ID, and then calls the payment in the APP!

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

According to the parameters required for document splicing, here are a few methods to directly go to the code!

The transmitted parameters must be assembled and sent in xml format, such as the parameter array!

Public function ToXml ($ data = array () {if (! Is_array ($ data) | count ($ data) <= 0) {return 'array exception';} $ 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 a random string. Required parameter! There are many ways to do this. You can do whatever you like!

Function rand_code () {$ str = 'hangzhou'; // 62 characters $ str = str_shuffle ($ str); $ str = substr ($ str ); return $ str ;}

3. This is an important step. This method will be used multiple times! Generate a signature

Private function getSign ($ params) {ksort ($ params); // sort the parameter array in ascending order of the parameter ASCII code ($ params as $ key => $ item) {if (! Empty ($ item) {// removes the parameter $ newArr [] = $ key. '= '. $ item; // integrate the new parameter array} $ stringA = implode ("&", $ newArr); // use the & symbol to connect the parameter $ stringSignTemp = $ stringA. "& key = ". "************************"; // concatenate the key // key is the $ stringSignTemp = MD5 ($ stringSignTemp) set in the API security of the merchant platform ); // perform MD5 encryption on the string $ sign = strtoupper ($ stringSignTemp); // convert all characters into uppercase return $ sign ;}

4. Pass the parameter to generate a pre-payment order! After receiving the returned data, the APP calls the payment interface to complete the payment! For the parameters required for the APP end, see the document: 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 (); // call the random string generation method to obtain the random string $ data ['appid '] = 'wxdbc5dc *******'; // appid $ data ['mch _ id'] = '2017 ***** '; // merchant id $ data ['body'] = "APP payment test "; $ data ['spbill _ create_ip'] = $ _ SERVER ['HTTP _ host']; // ip address $ data ['total _ host'] = 1; // amount $ data ['out _ trade_no '] = time (). mt_rand (random, 99999); // Merchant Order number, which cannot be repeated $ data ['nonce _ str'] = $ nonce_str; // random string $ data ['random Y _ url'] = 'HTTP: // xxx.xxx.com/wx_policy'; // The callback address. After receiving the notification, the user must be a URL that can be accessed directly, the parameter $ data ['trade _ type'] = 'app'; // payment method // Save the data involved in the signature to the array. Note: the preceding parameters are appended to $ data, $ data should contain all data other than sign required in the Development documentation. $ data ['sign'] = $ this-> getSign ($ data ); // get the signature $ xml = $ this-> ToXml ($ data); // convert the array to xml // curl to the party $ 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, scheme); 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, expires, 2); // strict validation} // set header curl_setopt ($ ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1); curl_setopt ($ ch, CURLOPT_HEADER, FALSE); // The result must be a string and Output Curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, TRUE) on the screen; // set the timeout curl_setopt ($ ch, CURLOPT_TIMEOUT, 30); curl_setopt ($ ch, CURLOPT_POST, TRUE ); // transfer the file curl_setopt ($ ch, CURLOPT_POSTFIELDS, $ xml); // run curl $ data = curl_exec ($ ch); // return the result if ($ data) {curl_close ($ ch); // return success. Convert xml data to an array. $ re = $ this-> FromXml ($ data); if ($ re ['Return _ Code']! = 'Success') {json ("201", 'signature failed');} else {// receives the returned data and sends it to the APP! $ Arr = array ('prepayid' => $ re ['prepay _ id'], 'appid '=> 'wxdbc5dc *****', 'aterid' => '1970 ***** ', 'package' => 'sign = wxpay', 'noncestr' => $ nonce_str, 'timestamp' => time (),); // The second signature generated $ sign = $ this-> getSign ($ arr ); $ arr ['sign'] = $ sign; json ('000000', 'signature successful ', $ arr) ;}} else {$ error = curl_errno ($ ch ); curl_close ($ ch); json ('20140901', "curl error, error code: $ error ");}}

5. Convert xml data to an array and use it when receiving returned data.

Public function FromXml ($ xml) {if (! $ Xml) {echo "xml Data Exception! ";}// Convert XML into array // disable reference to external xml Entity 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, the callback address you entered will be called.

For return parameters, see the document: https://pay.weixin.qq.com/wiki/doc/api/app/app.php? Chapter = 9_7 & index = 3

// Payment callback function wx_notify () {// receives the returned data in the xml format $ xmlData = file_get_contents ('php: // input '); // convert the xml format to an array $ data = $ this-> FromXml ($ xmlData); // use a log record to check whether the data is accepted successfully. After the verification is successful, it can be deleted. $ File = fopen ('. /log.txt ', 'a +'); fwrite ($ file, var_export ($ data, true); // verify whether the signature is the same as the returned signature to prevent false data. // Record the returned signature. The sign field must be excluded when the signature is generated. $ Sign = $ data ['sign']; unset ($ data ['sign']); if ($ sign = $ this-> getSign ($ data )) {// if ($ data ['result _ Code'] = 'success ') returned after signature verification is successful ') {// business logic based on the returned order Number $ arr = array ('pay _ status' => 1,); $ re = M ('order ') -> where (['order _ sn '=> $ data ['out _ trade_no'])-> save ($ arr); // after processing is complete, the success result is displayed! If ($ re) {echo '<xml> <return_code> <! [CDATA [SUCCESS]> </return_code> <return_msg> <! [CDATA [OK]> </return_msg> </xml> '; exit () ;}// payment failed. The error message else {$ file = fopen ('. /log.txt ', 'a +'); fwrite ($ file, "error message :". $ data ['Return _ msg ']. date ("Y-m-d H: I: s"), time (). "\ r \ n") ;}} else {$ file = fopen ('. /log.txt ', 'a +'); fwrite ($ file, "error message: Signature Verification Failed ". date ("Y-m-d H: I: s"), time (). "\ r \ n ");}}

Here, the APP payment process is complete! Thank you for your support!

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