+ * Access/Modify private global variable `$_wp_using_ext_object_cache`.
+ *
+ * Toggle `$_wp_using_ext_object_cache` on and off without directly
+ * touching global.
+ *
+ * @since 3.7.0
+ *
+ * @param bool $using Whether external object cache is being used.
+ * @return bool The current 'using' setting.
+ */
+function wp_using_ext_object_cache( $using = null ) {
+ global $_wp_using_ext_object_cache;
+ $current_using = $_wp_using_ext_object_cache;
+ if ( null !== $using )
+ $_wp_using_ext_object_cache = $using;
+ return $current_using;
+}
+
+/**
+ * Start the WordPress object cache.