How can sessions be used to handle login/logout functionality in PHP?

Sessions can be used to handle login/logout functionality in PHP by storing the user's login status in a session variable. When a user logs in, set a session variable to indicate that the user is authenticated. When the user logs out, unset the session variable to indicate that the user is no longer authenticated. 

// Start the session
session_start();

// Check if the user is logged in
if(isset($_SESSION['logged_in']) && $_SESSION['logged_in'] === true) {
    echo "User is logged in.";
} else {
    echo "User is not logged in.";
}

// Log the user in
$_SESSION['logged_in'] = true;

// Log the user out
unset($_SESSION['logged_in']);

Keywords

PHP sessions login logout functionality

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