define('WP_USE_THEMES', true);
require( '/opt/bitnami/apps/wordpress/htdocs/wp-blog-header.php' );

include (/opt/bitnami/apps/wordpress/htdocs/wp-content/themes/xxx/functions.php);

require($_SERVER['DOCUMENT_ROOT'] . '/wp-load');
require(/opt/bitnami/apps/wordpress/htdocs/wp-load');