Notification which is conditional on yes radio choices

<?php
// http://www.gravityhelp.com/forums/topic/automatic-notification-if-multiple-radio-buttons-selected#post-93500
// change the 228 here to your form ID
add_filter('gform_pre_submission_filter_228', 'yes_or_no_notification');
function yes_or_no_notification($form){

        // initialize value to prevent 'undefined' notice
        $yes = 0;

        // an array of all the radio button fields to be included in our yes/no check
        $questions = array(5,6,8,9,10,11,12,13,14,15,16,17,18,19,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,46,47);

        // loop through all form fields looking for Yes answers
        foreach ($questions as $field) {
                if (rgpost("input_{$field}") == 'Yes'){
                        // we're actually going to count the yes answers
                        $yes++;
                }
        }

        // set the admin notification message based on the number of yes responses
        if($yes == 0) {
                $form['notification']['message'] = "<p>This is the admin notification if all questions were answered NO.";
        }
        else {
                $form['notification']['message'] = "<p>This is the admin notification if any question was answered YES.";
        }

        // append the total YES answers onto the message either way
        $form['notification']['message'] .= "<br />Total <strong>YES</strong> answers: $yes</p>";

        // return modified form
        return $form;
}