+ /**
+ * Memory for the number of times unique class instances have been hashed.
+ *
+ * This can be eliminated in favor of straight spl_object_hash() when 5.3
+ * is the minimum requirement for PHP.
+ *
+ * @since 4.6.0
+ * @access private
+ * @var array
+ *
+ * @see WP_Widget_Factory::hash_object()
+ */
+ private $hashed_class_counts = array();
+
+ /**
+ * Hashes an object, doing fallback of `spl_object_hash()` if not available.
+ *
+ * This can be eliminated in favor of straight spl_object_hash() when 5.3
+ * is the minimum requirement for PHP.
+ *
+ * @since 4.6.0
+ * @access private
+ *
+ * @param WP_Widget $widget Widget.
+ * @return string Object hash.
+ */
+ private function hash_object( $widget ) {
+ if ( function_exists( 'spl_object_hash' ) ) {
+ return spl_object_hash( $widget );
+ } else {
+ $class_name = get_class( $widget );
+ $hash = $class_name;
+ if ( ! isset( $widget->_wp_widget_factory_hash_id ) ) {
+ if ( ! isset( $this->hashed_class_counts[ $class_name ] ) ) {
+ $this->hashed_class_counts[ $class_name ] = 0;
+ }
+ $this->hashed_class_counts[ $class_name ] += 1;
+ $widget->_wp_widget_factory_hash_id = $this->hashed_class_counts[ $class_name ];
+ }
+ $hash .= ':' . $widget->_wp_widget_factory_hash_id;
+ return $hash;
+ }
+ }
+