/**
* Main plugin Instance
*
* @return YITH_Multistep_Checkout Main instance
* @author Andrea Grillo <*****@*****.**>
*/
public static function instance()
{
if (is_null(self::$_instance)) {
self::$_instance = new self();
}
return self::$_instance;
}
/**
* Unique access to instance of YITH_Vendors class
*
* @return YITH_Multistep_Checkout|YITH_Multistep_Checkout_Premium
* @since 1.0.0
*/
function YITH_Multistep_Checkout()
{
// Load required classes and functions
require_once YITH_WCMS_PATH . 'includes/class.yith-multistep-checkout.php';
if (defined('YITH_WCMS_PREMIUM') && file_exists(YITH_WCMS_PATH . 'includes/class.yith-multistep-checkout-premium.php')) {
require_once YITH_WCMS_PATH . 'includes/class.yith-multistep-checkout-premium.php';
return YITH_Multistep_Checkout_Premium::instance();
}
return YITH_Multistep_Checkout::instance();
}