PHP WeChat development-problems with automatic reply to WeChat messages

This article is related to the pitfalls encountered in the automatic reply of messages introduced by Xiaobian. it is frequently encountered in daily project development and has reference value, if you are interested in learning it together, this article is a small article about the pitfalls encountered in the automatic reply of the message, which is frequently encountered in daily project development, it is very useful for reference. if you are interested, learn it together.

Reply principle:

When a common user sends a message to a public account, the server first receives the message sent by the user;

Then, package user information and messages into XML data packets, and then submit the XML data packets to the URL set by the developer through the POST method.

Question 1: Why do I use $ GLOBALS ["HTTP_RAW_POST_DATA"] to save POST data instead of the $ _ POST array?

Answer:

POST can only store standard data types, but cannot parse content such as XML, SOAP, or Application/Octet-steam.

$ GLOBALS ["HTTP_RAW_POST_DATA"] is the same as $ _ POST. If PHP can identify the POST data, it can be received using $ GLOBALS ["HTTP_RAW_POST_DATA.

Question 2: What are the parameters and return values of simplexml_load_file?

Answer:

Parameter description

String: the XML string to be processed.

Class: Used to specify a new object. it is usually set to "SimpleXMLElement" to generate a class for simple XML elements.

Options: specify the additional Libxml parameter. it is usually set to the constant LIBXML_NOCDATA, which indicates that CDATA is set to a text node.

Ns: generally omitted

Is_prefix: generally omitted

After the function is executed, an object of the SimpleXMLElement class is returned.

Function: the public account only accepts text messages and replies accordingly.

 Valid (); class Wechat {public function valid () {$ echoStr = $ _ GET ['echostr']; // if it is the first access if ($ this-> checkSignature () & $ echoStr) {echo $ echoStr; exit;} else {$ this-> responseMsg () ;}// check method private function checkSignature () {$ signature = $ _ GET ['signature']; $ timestamp = $ _ GET ['timestamp']; $ nonce = $ _ GET ['nonce ']; $ token = TOKEN; $ tmpArr = array ($ token, $ timestamp, $ nonce); sort ($ tmpArr); $ tmpStr = implode ($ tmpArr ); $ tmpStr = sha1 ($ tmpStr); if ($ tmpStr ==$ signature) {return true;} else {return false ;}}/* common text message
  
  toUser
   
  fromUser
   
  
   
1348831860
   
  text
   
  this is a test
   
 */Public function responseMsg () {// obtain the data in the server POST request $ postStr = $ GLOBALS ["HTTP_RAW_POST_DATA"]; if (! Empty ($ postStr) {$ postObj = simplexml_load_string ($ postStr, 'simplexmlelement', LIBXML_NOCDATA); $ fromUser = $ postObj-> FromUserName; $ toUser = $ postObj-> ToUserName; $ keyword = trim ($ postObj-> Content); $ time = time (); $ template ="
  
  %s
   
  %s
   
  
   
% S
   
  %s
   
  %s
   
 "; If (strtolower ($ postObj-> MsgType )! = 'Text') {$ msgType = "text"; $ content = "I only accept text messages";} else {$ msgType = "text"; if (! Empty ($ keyword) {$ content = "the message you sent is :". $ postObj-> Content;} else {$ content = "enter a keyword"; // The message is empty.} $ info = sprintf ($ template, $ fromUser, $ toUser, $ time, $ msgType, $ content); echo $ info;} else {echo ""; exit ;}}}

Function: the public account only accepts image messages and replies accordingly.

 Valid (); class Wechat {public function valid () {$ echoStr = $ _ GET ['echostr']; // if it is the first access if ($ this-> checkSignature () & $ echoStr) {echo $ echoStr; exit;} else {$ this-> responseMsg () ;}// check method private function checkSignature () {$ signature = $ _ GET ['signature']; $ timestamp = $ _ GET ['timestamp']; $ nonce = $ _ GET ['nonce ']; $ token = TOKEN; $ tmpArr = array ($ token, $ timestamp, $ nonce); sort ($ tmpArr); $ tmpStr = implode ($ tmpArr ); $ tmpStr = sha1 ($ tmpStr); if ($ tmpStr ==$ signature) {return true;} else {return false ;}}/* receives the image message format
  
  toUser
   
  fromUser
   
  
   
1348831860
   
  image
   
  this is a url
   
  media_id
   
  
   
1234567890123456
   
 */Public function responseMsg () {// obtain the data in the server POST request $ postStr = $ GLOBALS ["HTTP_RAW_POST_DATA"]; if (! Empty ($ postStr) {$ postObj = simplexml_load_string ($ postStr, 'simplexmlelement', LIBXML_NOCDATA); $ fromUser = $ postObj-> FromUserName; $ toUser = $ postObj-> ToUserName; $ time = time (); $ msgType = $ postObj-> MsgType; $ picUrl = $ postObj-> PicUrl; $ mediaId = $ postObj-> MediaId; $ template ="
  
  %s
   
  %s
   
  
   
% S
   
  %s
   
  %s
   
 "; If (strtolower ($ msgType )! = 'Image') {$ msgType = "text"; $ content = "I only accept image messages";} else {$ msgType = "text"; if (! Empty ($ picUrl) {$ content = "image link :". $ picUrl. "\ n"; $ content. = "media id :". $ mediaId;} else {$ content = "please send an image"; // The message is empty.} $ info = sprintf ($ template, $ fromUser, $ toUser, $ time, $ msgType, $ content); echo $ info;} else {echo "; exit ;}}}

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