core/DataTable/Bridges.php

<?php

/**
 * Matomo - free/libre analytics platform
 *
 * @link    https://matomo.org
 * @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 */

/**
 * This contains the bridge classes which were used prior to Piwik 2.0
 * The serialized reports contains these classes below, which were not using namespaces yet
 *
 * phpcs:ignoreFile Squiz.Classes.ValidClassName.NotCamelCaps
 */
namespace {

    use Piwik\DataTable\Row;
    use Piwik\DataTable\Row\DataTableSummaryRow;

    class Piwik_DataTable_Row_DataTableSummary extends DataTableSummaryRow
    {
    }

    class Piwik_DataTable_Row extends Row
    {
    }

    // only used for BC to unserialize old archived Row instances. We cannot unserialize Row directly as it implements
    // the Serializable interface and it would fail on PHP5.6+ when userializing the Row instance directly.
    class Piwik_DataTable_SerializedRow
    {
        public $c;
    }

}