How can PHP be used to check if a user is logged in on both frames of a website?

To check if a user is logged in on both frames of a website, you can use PHP sessions to store the user's login status. When a user logs in, set a session variable to indicate they are logged in. Then, on each page load, check this session variable to determine if the user is logged in. This way, both frames can access the session variable and verify the user's login status. 

// Start the session
session_start();

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

Keywords

PHP user authentication session management cross-frame communication website security

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