The beginning code for a child theme functions.php file

Child theme start

<?php
/**
 * Functions
 * @package      The Stiz Media
 * @author       JiveDig <mike@thestizmedia.com>
 * @copyright    Copyright (c) 2013, The Stiz
 */

// Start the engine
require_once( get_template_directory() . '/lib/init.php' );

// Definte child theme
define( 'CHILD_THEME_NAME', 'The Stiz Media' );
define( 'CHILD_THEME_URL', 'http://thestizmedia.com' );

// Add Viewport meta tag for mobile browsers
add_action( 'genesis_meta', 'sample_viewport_meta_tag' );
function sample_viewport_meta_tag() {
  echo '<meta name="viewport" content="width=device-width, initial-scale=1.0"/>';
}