What is the difference between using GET and POST methods in PHP for passing data in URLs?

When passing data in URLs, the main difference between using GET and POST methods in PHP is that GET appends data to the URL, making it visible in the address bar and limited in the amount of data that can be sent, while POST sends data in the background, making it not visible in the address bar and allowing for larger amounts of data to be sent securely.

// Using GET method to pass data in URLs
$data = $_GET['data'];

// Using POST method to pass data in URLs
$data = $_POST['data'];