Is it recommended to use both GET and POST methods simultaneously in PHP?

It is not recommended to use both GET and POST methods simultaneously in PHP as it can lead to confusion and potential security vulnerabilities. It is best practice to choose one method based on the type of data being sent. If you need to handle both GET and POST requests, you can check the request method using the $_SERVER['REQUEST_METHOD'] variable and then process the data accordingly.

if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    // Handle GET request
    $data = $_GET['data'];
    // Process data
} elseif ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // Handle POST request
    $data = $_POST['data'];
    // Process data
} else {
    // Invalid request method
    http_response_code(405);
    exit('Method Not Allowed');
}