Shulou(Shulou.com)06/03 Report--

Editor to share with you the PHP Wechat development of Wechat message automatic response to the problems encountered, I believe most people do not know much, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to understand it!

Wechat reply principle:

When an ordinary Wechat user sends a message to a public account, the Wechat server first receives the message sent by the user

The user information and messages are then packaged into a packet in XML format, and the XML packet is submitted to the URL set by the developer through the POST method.

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

Answer:

POST can only hold standard data types and cannot be parsed for things like XML, SOAP, or Application/Octet-steam.

While $GLOBALS ["HTTP_RAW_POST_DATA"] and $_ POST are the same, if the data from POST is recognized by PHP, it can be received with $GLOBALS ["HTTP_RAW_POST_DATA"].

Question 2: what are the parameters and return values of simplexml_load_file ()?

Answer:

Parameter meaning

String: the XML string to be processed.

Class: used to specify a new object, usually set to "SimpleXMLElement", to generate a class of simple XML elements.

Options: specifies an additional Libxml parameter, usually set to a constant LIBXML_NOCDATA, which means that CDATA is set as a text node.

Ns: general omission

Is_prefix: general omission

Returns an object of the SimpleXMLElement class when the function is finished.

Function: the official account only accepts text messages and makes corresponding text responses.

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