What is the significance of using $_POST['haltestelle'] or $_GET['haltestelle'] to retrieve data in PHP forms?

Using $_POST['haltestelle'] or $_GET['haltestelle'] in PHP forms allows you to retrieve data submitted by the user through either the POST or GET method, respectively. This is essential for processing form data and interacting with databases or other parts of your application. Depending on the form's method attribute, you should use the appropriate superglobal to access the form data.

$haltestelle = isset($_POST['haltestelle']) ? $_POST['haltestelle'] : (isset($_GET['haltestelle']) ? $_GET['haltestelle'] : '');