Metaregistrar\EPP\eppConnection::addExtension PHP Method

    public function addExtension($xmlns, $namespace)
    {
        $this->exturi[$namespace] = $xmlns;
        // Include the extension data, request and response files
        $pos = strrpos($namespace, '/');
        if ($pos !== false) {
            $path = substr($namespace, $pos + 1, 999);
            if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
                $includepath = dirname(__FILE__) . '\\eppExtensions\\' . $path . '\\includes.php';
            } else {
                $includepath = dirname(__FILE__) . '/eppExtensions/' . $path . '/includes.php';
            }
        } else {
            $pos = strrpos($namespace, ':');
            if ($pos !== false) {
                $path = substr($namespace, $pos + 1, 999);
                if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
                    $includepath = dirname(__FILE__) . '\\eppExtensions\\' . $path . '\\includes.php';
                } else {
                    $includepath = dirname(__FILE__) . '/eppExtensions/' . $path . '/includes.php';
                }
            } else {
                if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
                    $includepath = dirname(__FILE__) . '\\eppExtensions\\' . $namespace . '\\includes.php';
                } else {
                    $includepath = dirname(__FILE__) . '/eppExtensions/' . $namespace . '/includes.php';
                }
            }
        }
        if (is_file($includepath)) {
            include_once $includepath;
        }
    }