How can you check if a user is logged in using PHP sessions?

To check if a user is logged in using PHP sessions, you can set a session variable upon successful login and then check for the existence of that session variable on subsequent pages to determine if the user is logged in. If the session variable exists, the user is logged in; otherwise, they are not. 

session_start();

if(isset($_SESSION['logged_in'])){
    // User is logged in
    echo "User is logged in";
} else {
    // User is not logged in
    echo "User is not logged in";
}

Keywords

PHP sessions authentication isLoggedIn isset

Related Questions