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

When manipulating data in PHP, it is important to understand the differences between using the GET and POST methods. GET method appends data to the URL, making it visible to users, while POST method sends data in the HTTP request body, keeping it hidden. GET method is suitable for retrieving data or performing read-only operations, while POST method is more secure and suitable for data manipulation that involves creating, updating, or deleting records.

// Example of using POST method for data manipulation in PHP
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form data and manipulate database records
}