Php dry web page login page, pass data, variable is invalid, solve

Source: Internet
Author: User
Php makes a webpage login page and transmits data. the variable is invalid. three variables are set for solving php. it is found that only $ select is valid and the other two are invalid. what is the problem? I am grateful for the login interface code: & lt; head & gt; & lt; meta & nbsp; http php webpage login page, data transmission, invalid variable, solution
Php sets a total of three variables, and found that only $ select is valid at the time of determination, and the other two are invalid. what is the problem?
Please answer your questions and hurry up with the task.
I am very grateful for your help.

Logon interface code:



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Southwest China University for Nationalities




Lab teaching management system





User logon






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