Product Detail from External Source

function my_produkt_detail($ean, $field_path = '', $default = '') {

    static $cache = array();

    try {

        if (empty($ean) || !is_string($ean)) {

            return $default;

        }

        if (!isset($cache[$ean])) {

            $detail_url = "https://db.ecoinform.de/ecodb.php/produktdetail?partner=2a3ea8f338618ff8&lang=DE&ean=" . urlencode($ean);

            $response = wp_remote_get($detail_url, array(

                'timeout' => 30,

                'headers' => array(

                    'User-Agent' => 'WordPress/' . get_bloginfo('version') . '; ' . home_url()

                )

            ));

            if (is_wp_error($response)) {

                $cache[$ean] = null;

                return $default;

            }

            $status_code = wp_remote_retrieve_response_code($response);

            if ($status_code !== 200) {

                $cache[$ean] = null;

                return $default;

            }

            $xml_body = wp_remote_retrieve_body($response);

            if (empty($xml_body)) {

                $cache[$ean] = null;

                return $default;

            }

            libxml_use_internal_errors(true);

            libxml_clear_errors();

            $detail_xml = simplexml_load_string($xml_body, 'SimpleXMLElement', LIBXML_NOCDATA);

            if ($detail_xml === false) {

                $cache[$ean] = null;

                libxml_use_internal_errors(false);

                return $default;

            }

            $cache[$ean] = $detail_xml;

            libxml_use_internal_errors(false);

        }

        $data = $cache[$ean];

        if ($data === null) {

            return $default;

        }

        if (empty($field_path)) {

            return $data;

        }

        $keys = explode('.', $field_path);

        $current = $data;

        foreach ($keys as $key) {

            if (isset($current->$key)) {

                $current = $current->$key;

            } else {

                return $default;

            }

        }

        return (string) $current;

    } catch (Exception $e) {

        error_log('Product Detail Function - Error for EAN ' . $ean . ': ' . $e->getMessage());

        return $default;

    }

}