How to let the login module display the login screen before login, and display user information after login?

I know it is through the session to judge, that is, after the session through the template how to become a user login information?

Reply to discussion (solution)

User information is fully written to the session template determines whether the user information in the output session or the login box

I usually use the session to judge the corresponding state of the content, if you want to better effect can be used to judge the use of JS.

Login Save
Session_Start ();
$_session[' username '] = $_post[' username '];


Page display
Session_Start ();
echo $_session[' username '];

The simple thing is to use the session

If Judge Bai direct PHP echo HTML code

