What is the correct way to check if a user is logged in using session variables in PHP?

To check if a user is logged in using session variables in PHP, you can verify if a specific session variable, like 'user_id', is set. If the 'user_id' session variable is set, it means the user is logged in. You can then use this information to control access to certain pages or functionalities on your website. 

session_start();

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

Keywords

PHP session variables authentication logged in validation

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