Gravity Form Access the input values of individual form elements using their IDs like so

Following the Gravity guidelines you set up the hook to call your own function - in the case below the function is after_submission().

You can access the input values of individual form elements using their IDs like so;

add_action("gform_after_submission", "after_submission", 10, 2);

function after_submission($entry, $form){

    $name = $entry["2"];

    $address = $entry["17"] . ', '. $entry["18"] .', '. $entry["19"];

}