Questions about the main page displayed when PHP jumps from the login interface to the homepage

Problems with the main page when PHP jumps from the login interface to the homepage
Novice on the road, ask for answers! When I jump from login.html to homepage.html, how do i show "XXX welcome!" on the home page? ”。 I used a session, and then I read the data from the database.

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Session_Start ();
if (Isset ($_session[' user ')) echo $_session[' user '], ' welcome! ';

?>
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Jump from login.html to homepage.html you can't just jump to homepage.html, right?
Is there a php file in the middle of the check? Or did you just write the wrong two PHP files?
PHP file

Session_Start ();
echo $_session[' UserName '];//here is the name of the variable that you defined when login was detected
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Homepage.html is a static page, can you read the session?
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That's right.
Change your homepage.html to homepage.php

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Homepage.html is a static page, can you read the session?

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