Edit: DbCache_WpdbBase.php
<?php /** * File: DbCache_WpdbBase.php * * @package W3TC */ namespace W3TC; global $wp_version; if ( version_compare( $wp_version, '6.1-beta1', '>=' ) ) { require_once ABSPATH . WPINC . '/class-wpdb.php'; } else { require_once ABSPATH . WPINC . '/wp-db.php'; } /** * Class DbCache_WpdbBase */ class DbCache_WpdbBase extends \wpdb { }
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