What are the differences between using GET and POST methods in PHP for data retrieval and storage?

When retrieving data, the GET method appends data to the URL, making it visible to users and limited in size. On the other hand, the POST method sends data in the HTTP request body, making it more secure and suitable for larger amounts of data. When storing data, the GET method is not recommended as it exposes sensitive information, while the POST method is preferred for securely storing data.

// Retrieving data using GET method
$data = $_GET['data'];

// Retrieving data using POST method
$data = $_POST['data'];

// Storing data using GET method (not recommended)
$data = $_GET['data'];

// Storing data using POST method
$data = $_POST['data'];