placeholder_escape example

unset(
            $args['cache_results'],
            $args['fields'],
            $args['lazy_load_term_meta'],
            $args['update_post_meta_cache'],
            $args['update_post_term_cache'],
            $args['update_menu_item_cache'],
            $args['suppress_filters']
        );

        $placeholder = $wpdb->placeholder_escape();
        array_walk_recursive(
            $args,
            /* * Replace wpdb placeholders with the string used in the database * query to avoid unreachable cache keys. This is necessary because * the placeholder is randomly generated in each request. * * $value is passed by reference to allow it to be modified. * array_walk_recursive() does not return an array. */
            static function D &$value ) use ( $wpdb, $placeholder ) {
                

    public function add_placeholder_escape( $query ) {
        /* * To prevent returning anything that even vaguely resembles a placeholder, * we clobber every % we can find. */
        return str_replace( '%', $this->placeholder_escape(), $query );
    }

    /** * Removes the placeholder escape strings from a query. * * @since 4.8.3 * * @param string $query The query from which the placeholder will be removed. * @return string The query with the placeholder removed. */
    public function remove_placeholder_escape( $query ) {