$_Session “complication” on login and logout php

Question

I\'m doing a database project for university and I\'m strugling with a problem in here. I\'m trying to show \"log in\" when there\'s no session and \"log out\" when there is

Answer 1

when your login is success on login page.

session_start();
$_SESSION['user_logged_in'] = true;

in your logout page

session_start();
unset($_SESSION['user_logged_in']);   
session_destroy();

in your home page

<?php 
   session_start();
   if(isset($_SESSION['user_logged_in'])) {
 ?>
   < a href='logout.php'>Logout</a>
<?php  
   }
else {
?>
    < a href='login.php'>Login</a>
<?php 
  }
 ?>