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

To check if a user is logged in using PHP sessions, you can verify if a specific session variable, such as "user_id", is set. If the variable is set, it means the user is logged in. You can then use this information to control access to certain parts of your website or display personalized content. 

session_start();

if(isset($_SESSION['user_id'])){
    // User is logged in
    // You can access the user's information using $_SESSION['user_id']
} else {
    // User is not logged in
    // Redirect to login page or display a message
}

Keywords

PHP sessions authentication user login security

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