Method renderRequiredParts

/*
 * Two features in one function
 * 1) return required parts
 *    If the attribute is required, return different required parts (attribute - html5, class - jquery, span - heading)
 * 2) Initialize JQuery Check for required fields working with HTML 5
 *    Checkboxes cannot be checked by HTML 5, so we need help of jQuery which manage for example:
 *    There are 3 checkboxes - one selected, two not (It is OK but not for HTML5)
 */
public static function renderRequiredParts($id, $required)
{
    // If the attribute is required
    $req['attribute'] = '';
    // Attribute - required field HTML 5
    $req['span'] = '';
    // Span - displayed * next to title
    $req['class'] = '';
    // Class - Checkboxes cannot be checked per HTML 5, jquery used PhocacartRenderJs::renderCheckBoxRequired()
    $req['required'] = 0;
    // data-required attribute
    if ($required) {
        $req['attribute'] = ' required="" aria-required="true"';
        $req['span'] = ' <span class="ph-req">*</span>';
        $req['class'] = ' checkbox-group-' . (int) $id . ' checkbox-group required';
        $req['required'] = 1;
    }
    return $req;
}