WeChat public platform development (2) WeChat public platform sample code analysis-PHP Tutorial

Public platform development (2) public platform sample code analysis. The public platform provides a simple php sample code. before further development, we need to take a closer look at it. Official website: mp. weixin. qq. comatrix Resht

The public platform provides a simple php sample code. before further development, we need to take a closer look at it.

Official website: http://mp.weixin.qq.com/mpres/htmledition/res/wx_sample.zip

The complete code is as follows:

   = ["echostr"        (->           = ["HTTP_RAW_POST_DATA"         (!( = (, 'SimpleXMLElement', = -> = -> = (-> =  = "                            
 %s
                             
 %s
                             
 
  %s
                             
 %s
                             
 %s
                             
 
  0
                             "(!(  = "text" = "Welcome to wechat world!" = (, , , , ,   "Input something..." ""  = ["signature" = ["timestamp" = ["nonce" = = (, , ( = (  = ( (  ==   ?>

3.1 Overall analysis

The original sample code is roughly divided into four parts:

• Define TOKEN
• Declare a wechatCallbackapiTest class
• Create an instance object like wechatCallbackapiTest $ wechatObj
• Call the valid () method of the class.

3.2 Detailed analysis

3.2.1 define TOKEN

3.2.2 declare a class

ResponseMsg Function details:

$ PostStr = $ GLOBALS ["HTTP_RAW_POST_DATA"];
Receive the user message sent from the public platform. the Message data structure is XML, which is not the default data type recognized by php. Therefore, $ GLOBALS ['http _ RAW_POST_DATA '] is used to receive the message, $ postStr

If (! Empty ($ postStr ))
Determine whether $ postStr is null. if it is not null (data is received), continue to execute the following statement. if it is null, jump to the corresponding else statement.

$ PostObj = simplexml_load_string ($ postStr, 'simplexmlelement', LIBXML_NOCDATA );
Use the simplexml_load_string () function to load the received XML message data to the $ postObj object. This rigorous writing method is followed by a conditional statement to determine whether the load is successful, but it is okay if you do not write it.

$ FromUsername = $ postObj-> FromUserName;
Assign the OPENID of the sender of the object $ postObj to the $ fromUsername variable.

$ ToUsername = $ postObj-> ToUserName;
Assign the ID of the public account in the object $ postObj to the $ toUsername variable.

$ Keyword = trim ($ postObj-> Content );
The trim () function removes white spaces and other pre-defined characters from both ends of the string. here, you can get the keywords entered by the user.

$ Time = time ();
The time () function returns the Unix timestamp of the current time, that is, the number of seconds from the Unix epochs (00:00:00 GMT, January 1, January 1, 1970) to the current time.

$ TextTpl ="
 
  
　　　　　　　
  %s
  
  
　　　　　　　
  %s
  
  
　　　　　　  
  
   
% S
  
  
　　　　　　　
  %s
  
  
　　　　　　　
  %s
  
  
　　　　　　　
  
   
0
  
  
　　　　　　　
 ";
Template for storing Output Content

If (! Empty ($ keyword ))
Judge whether $ keyword is null. if it is not null, continue to execute the following statement. if it is null, jump to the corresponding else statement, that is, echo "Input something... ";

$ MsgType = "text ";
The message type is text.

$ ContentStr = "Welcome to wechat world! ";
Reply message content

$ ResultStr = sprintf ($ textTpl, $ fromUsername, $ toUsername, $ time, $ msgType, $ contentStr );
Use the sprintf () function to Write formatted data to the variable;
$ FromUsername, $ toUsername, $ time, $ msgType, $ contentStr, respectively, sequentially replace the "% s" position in the template, that is, the variable "$ resultStr" is actually:

$toUsername
$fromUsername
$ Time
$msgType
$contentStr
0 // The message received by the star when 0x0001 is marked.

Echo $ resultStr; // output the reply message

3.2.4 Call method verification

Valid ();

The above is an analysis of the official sample code. if the explanation is incorrect, please point it out. In addition, this code is just a simple sample code officially provided. if you want to perform complex development, you must rewrite the code in a rigorous development mode. we will explain it in subsequent tutorials.

Official public platform API documentation: http://mp.weixin.qq.com/wiki/index.php

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