<?php if(!class_exists('Wt_Import_Export_For_Woo_RemoteAdapter_Basic')){ abstract class Wt_Import_Export_For_Woo_RemoteAdapter_Basic { public $id=''; public $title=''; public function __construct() { } abstract public function upload($local_file, $remote_file_name, $form_data, $out); abstract public function delete(); } }