How can PHP developers effectively handle session expiration and user authentication in scenarios involving multiple requests, such as those made through Ajax?

When handling session expiration and user authentication in scenarios involving multiple requests, PHP developers can use AJAX to periodically check the session status and re-authenticate the user if needed. This can be achieved by sending a token or session ID with each AJAX request and verifying it on the server side. If the session has expired or the user is not authenticated, the server can respond with an appropriate error message. 

// Check session status and re-authenticate user if needed
if(isset($_SESSION['user_id']) && isset($_SESSION['token'])) {
    // Verify session token
    $user_id = $_SESSION['user_id'];
    $token = $_SESSION['token'];

    // Perform authentication logic here
    if(!verifyToken($user_id, $token)) {
        // Session expired or user not authenticated
        http_response_code(401);
        exit();
    }
} else {
    // Session variables not set
    http_response_code(401);
    exit();
}

function verifyToken($user_id, $token) {
    // Verify token logic here
    // Return true if token is valid, false otherwise
}

Keywords

PHP session expiration user authentication Ajax requests error handling

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