Lines:

<?php

/**
 * Server-side rendering of the `core/gallery` block.
 *
 * @package WordPress
 */

/* function block_core_gallery_data_id_backcompatibility() – Handles backwards compatibility for Gallery Blocks,
whose images feature a `data-id` attribute. */

add_filter( 'render_block_data', 'block_core_gallery_data_id_backcompatibility' );

/* function block_core_gallery_render */
/* function register_block_core_gallery() – Registers the `core/gallery` block on server. */

add_action( 'init', 'register_block_core_gallery' );
 

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