public function getUserRoles( $user_id = 0 ) {
			$user_id = $user_id ? $user_id : get_current_user_id();
			if ( empty( $user_id ) ) {
				return array();
			}

			$user = new WP_User( $user_id );
			if ( isset( $user->roles ) ) {
				return $user->roles;
			}
			return array();
		}