container->singleton( Meta::class, Meta::class ); add_action( 'init', $this->container->callback( Meta::class, 'register_meta' ) ); add_action( 'updated_post_meta', function ( $meta_id, $post_id, $meta_key, $value ) { $this->container->get( Meta::class )->maybe_clear_optimizer_data( (int) $post_id, $meta_key, $value ); }, 10, 4 ); } }