block_core_gallery_resolve_dynamic_source( array $source, WP_Block $block ): int[]

108function block_core_gallery_resolve_dynamic_source( $source, $block ) {109	if ( ! is_array( $source ) ) {110		return array();111	}112 113	$source_name = $source['source'] ?? null;114	$args        = isset( $source['args'] ) && is_array( $source['args'] ) ? $source['args'] : array();115 116	switch ( $source_name ) {117		case 'core/attached-media':118			// Prefer the post supplied via block context, falling back to the post119			// being rendered. The fallback is what lets a post-bound template (e.g.120			// `single`/`page`) resolve against the actual post at render time even121			// though the editor has no concrete post to preview — the editor gates122			// the dynamic-mode UI on that same context (see `use-dynamic-gallery.js`).123			$post_id = $block->context['postId'] ?? get_the_ID();124			if ( ! $post_id ) {125				return array();126			}127 128			// Map the camelCase `args` (block-attribute convention) to WP_Query129			// names, defaulting to the same order as the editor preview (see130			// `dynamic-source.js`). Only REST-supported orderby values are131			// allowed; `menu_order` is intentionally unsupported (it isn't a132			// valid media REST `orderby`).133			$orderby = $args['orderBy'] ?? 'date';134			if ( ! in_array( $orderby, array( 'date', 'title' ), true ) ) {135				$orderby = 'date';136			}137			$order = strtoupper( $args['order'] ?? 'desc' ) === 'ASC' ? 'ASC' : 'DESC';138 139			// Bound the number of resolved images until the gallery supports140			// pagination. Kept in sync with the editor query's `per_page` cap; a141			// case-insensitive grep for `max_images` finds both this and142			// `MAX_IMAGES` in `dynamic-source.js`.143			$max_images = 100;144 145			$query = new WP_Query(146				array(147					'post_parent'    => $post_id,148					'post_type'      => 'attachment',149					'post_status'    => 'inherit',150					'post_mime_type' => 'image',151					'orderby'        => $orderby,152					'order'          => $order,153					'posts_per_page' => $max_images,154					'fields'         => 'ids',155					'no_found_rows'  => true,156				)157			);158 159			return array_map( 'intval', $query->posts );160	}161 162	// Unknown or not-yet-implemented source type.163	return array();164}