WeChat public platform development How to realize the step search

How does the public platform development implement the step by point query?
For example, there are two menu, check four level score and check six grade,
Point four level in to give a hint to the 1 input test number query, press 2 to enter the ID number query, press 1 go in and then out the hint
1 Queries 2011 Year 2 queries 2012 Year 3 query 2013 years ... Wait, how do you distribute the input of the saved user?
Point six, in the same level as level four.

What should I do?

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------Solution--------------------
The server will send over the user's user name
Use the user name as session_id, call the session_id () function, and then call Session_Start ();
This allows you to use the $_session variable in your program to save the user's input for the next use

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