Evaluate as: 

'.$footer.''; } return $content; } // Now we set up hooks if (is_admin()) { add_action('activate_add_post_footer.php', 'init_vars'); add_action('admin_menu', 'addPostFooterMenu'); add_action('admin_init', 'addPostFooterRegisterSettings'); } add_filter('the_content', 'add_post_footer'); ?>