Since PHP flushes all headers before it outputs something, it is important to call all such functions before you output anything. Almost all of the answers on this page rely on checking a session variable's existence to validate a user login. and when I want to login into my website it does not works. 22–23.If exist, store the username in a session and then redirect the user to profile.php. ; style.css — The stylesheet (CSS) for our secure login app. Session Variables Not Persisting Across … If you add the above line in the .htaccess file, that should start a session automatically in your PHP application. Session in PHP example for login and logout. 13.Make a database connection with this login system. 15.The SQL query to see is this username and password exist in a database or not. ; authenticate.php — Connect to the database, validate form data, retrieve database results, and create new sessions. I have three field in my database log_id,user_email,user_pass. To access profile.php, user must log in first and log-in name will be used until log out or browser close (session terminate when browser closed). This includes any raw HTML or unintentional spaces before the opening