function wpv_admin_import_data_from_xmlstring($xmlstring, $items = array(), $import_type = null)
{
    global $WP_Views;
    if (!empty($xmlstring)) {
        if (!function_exists('simplexml_load_string')) {
            return new WP_Error('xml_missing', __('The Simple XML library is missing.', 'wpv-views'));
        }
        $xml = simplexml_load_string($xmlstring);
        if (!$xml) {
            return new WP_Error('not_xml_file', sprintf(__('The XML could not be read.', 'wpv-views')));
        }
        $import_data = wpv_admin_import_export_simplexml2array($xml);
        if (isset($import_type)) {
            // import view templates
            if ('view-templates' == $import_type) {
                $result = wpv_admin_import_view_templates($import_data, $items);
                if ($result) {
                    return $result;
                }
            } elseif ('views' == $import_type) {
                $result = wpv_admin_import_views($import_data, $items);
                if ($result) {
                    return $result;
                }
            } else {
                $results = array('updated' => 0, 'new' => 0, 'failed' => 0, 'errors' => array());
                return $results;
            }
        }
    } else {
        // empty xml string
        $results = array('updated' => 0, 'new' => 0, 'failed' => 0, 'errors' => array());
        return $results;
    }
}
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function wpv_admin_import_data()
{
    global $WP_Views;
    if (isset($_FILES['import-file'])) {
        $file = $_FILES['import-file'];
    } else {
        $file = null;
    }
    if ($file == null) {
        // check for import from settings.xml in theme
        if (isset($_POST['import-file'])) {
            $file = array();
            $file['name'] = $_POST['import-file'];
            $file['tmp_name'] = $_POST['import-file'];
            $file['size'] = filesize($file['tmp_name']);
        }
    }
    $data = array();
    $info = pathinfo($file['name']);
    $is_zip = $info['extension'] == 'zip' ? true : false;
    if ($is_zip) {
        $zip = zip_open(urldecode($file['tmp_name']));
        if (is_resource($zip)) {
            while (($zip_entry = zip_read($zip)) !== false) {
                if (zip_entry_name($zip_entry) == 'settings.xml') {
                    $data = @zip_entry_read($zip_entry, zip_entry_filesize($zip_entry));
                }
            }
        } else {
            return new WP_Error('could_not_open_file', __('Unable to open zip file', 'wpv-views'));
        }
    } else {
        $fh = fopen($file['tmp_name'], 'r');
        if ($fh) {
            $data = fread($fh, $file['size']);
            fclose($fh);
        }
    }
    if (!empty($data)) {
        if (!function_exists('simplexml_load_string')) {
            return new WP_Error('xml_missing', __('The Simple XML library is missing.', 'wpv-views'));
        }
        $xml = simplexml_load_string($data);
        if (!$xml) {
            return new WP_Error('not_xml_file', sprintf(__('The XML file (%s) could not be read.', 'wpv-views'), $file['name']));
        }
        $import_data = wpv_admin_import_export_simplexml2array($xml);
        // import view templates first.
        $error = wpv_admin_import_view_templates($import_data);
        if ($error) {
            return $error;
        }
        // import views next.
        $error = wpv_admin_import_views($import_data);
        if ($error) {
            return $error;
        }
        // import views next.
        $error = wpv_admin_import_settings($import_data);
        if ($error) {
            return $error;
        }
    } else {
        return new WP_Error('could_not_open_file', __('Could not read the Views import file.', 'wpv-views'));
    }
}