Add a hotfix for Wordfence issue "Call to undefined method WP_SQLite_Driver::prepare()"

Author: JanJakes

wp-includes/sqlite/class-wp-sqlite-db.php

@@ -20,6 +20,25 @@ class WP_SQLite_DB extends wpdb {
 	 */
 	protected $dbh;
 
+	/**
+	 * We don't use mysqli, so it seems reasonable to set this to "false".
+	 * However, this property was originally used for a different purpose:
+	 *
+	 *   "Whether to use the mysqli extension over mysql."
+	 *
+	 * The property is not used anymore:
+	 *
+	 *   "This is no longer used as the mysql extension is no longer supported."
+	 *
+	 * Hence, it is likely safe to set this to "false". Doing so fixes a Wordfence
+	 * issue by hinting that we're not using mysqli. For more details, see:
+	 *
+	 *   https://github.com/WordPress/sqlite-database-integration/issues/284
+	 *
+	 * @var bool
+	 */
+	private $use_mysqli = false;
+
 	/**
 	 * Backward compatibility, see wpdb::$allow_unsafe_unquoted_parameters.
 	 *