What is the best practice for checking if a user is logged in using sessions in PHP?

To check if a user is logged in using sessions in PHP, you can verify if a specific session variable, such as a user ID, is set. If the session variable is set, it means the user is logged in. You can then use this information to control access to certain pages or features on your website. 

session_start();

if(isset($_SESSION['user_id'])) {
    // User is logged in
    // Add your code here for actions to be taken when user is logged in
} else {
    // User is not logged in
    // Redirect to login page or show a message
}

Keywords

PHP session authentication login security

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