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Editing: gallery.php

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

/**
 * Handles backwards compatibility for Gallery Blocks,
 * whose images feature a `data-id` attribute.
 *
 * Now that the Gallery Block contains inner Image Blocks,
 * we add a custom `data-id` attribute before rendering the gallery
 * so that the Image Block can pick it up in its render_callback.
 *
 * @since 5.9.0
 *
 * @param array $parsed_block The block being rendered.
 * @return array The migrated block object.
 */
function block_core_gallery_data_id_backcompatibility( $parsed_block ) {
	if ( 'core/gallery' === $parsed_block['blockName'] ) {
		foreach ( $parsed_block['innerBlocks'] as $key => $inner_block ) {
			if ( 'core/image' === $inner_block['blockName'] ) {
				if ( ! isset( $parsed_block['innerBlocks'][ $key ]['attrs']['data-id'] ) && isset( $inner_block['attrs']['id'] ) ) {
					$parsed_block['innerBlocks'][ $key ]['attrs']['data-id'] = esc_attr( $inner_block['attrs']['id'] );
				}
			}
		}
	}

return $parsed_block;
}

add_filter( 'render_block_data', 'block_core_gallery_data_id_backcompatibility' );

/**
 * Adds a unique ID to the gallery block context.
 *
 * @since 7.0.0
 *
 * @param array $context      Default context.
 * @param array $parsed_block Block being rendered, filtered by render_block_data.
 * @return array Filtered context.
 */
function block_core_gallery_render_context( $context, $parsed_block ) {
	if ( 'core/gallery' === $parsed_block['blockName'] ) {
		$context['galleryId'] = uniqid();
	}
	return $context;
}

add_filter( 'render_block_context', 'block_core_gallery_render_context', 10, 2 );

/**
 * Renders the `core/gallery` block on the server.
 *
 * @since 6.0.0
 *
 * @param array  $attributes Attributes of the block being rendered.
 * @param string $content    Content of the block being rendered.
 * @param array  $block      The block instance being rendered.
 * @return string The content of the block being rendered.
 */
function block_core_gallery_render( $attributes, $content, $block ) {
	// Adds a style tag for the --wp--style--unstable-gallery-gap var.
	// The Gallery block needs to recalculate Image block width based on
	// the current gap setting in order to maintain the number of flex columns
	// so a css var is added to allow this.

$gap = $attributes['style']['spacing']['blockGap'] ?? null;
	// Skip if gap value contains unsupported characters.
	// Regex for CSS value borrowed from `safecss_filter_attr`, and used here
	// because we only want to match against the value, not the CSS attribute.
	if ( is_array( $gap ) ) {
		foreach ( $gap as $key => $value ) {
			// Make sure $value is a string to avoid PHP 8.1 deprecation error in preg_match() when the value is null.
			$value = is_string( $value ) ? $value : '';
			$value = $value && preg_match( '%[\\\(&=}]|/\*%', $value ) ? null : $value;

// Get spacing CSS variable from preset value if provided.
			if ( is_string( $value ) && str_contains( $value, 'var:preset|spacing|' ) ) {
				$index_to_splice = strrpos( $value, '|' ) + 1;
				$slug            = _wp_to_kebab_case( substr( $value, $index_to_splice ) );
				$value           = "var(--wp--preset--spacing--$slug)";
			}

$gap[ $key ] = $value;
		}
	} else {
		// Make sure $gap is a string to avoid PHP 8.1 deprecation error in preg_match() when the value is null.
		$gap = is_string( $gap ) ? $gap : '';
		$gap = $gap && preg_match( '%[\\\(&=}]|/\*%', $gap ) ? null : $gap;

// Get spacing CSS variable from preset value if provided.
		if ( is_string( $gap ) && str_contains( $gap, 'var:preset|spacing|' ) ) {
			$index_to_splice = strrpos( $gap, '|' ) + 1;
			$slug            = _wp_to_kebab_case( substr( $gap, $index_to_splice ) );
			$gap             = "var(--wp--preset--spacing--$slug)";
		}
	}

$unique_gallery_classname = wp_unique_id( 'wp-block-gallery-' );
	$processed_content        = new WP_HTML_Tag_Processor( $content );
	$processed_content->next_tag();
	$processed_content->add_class( $unique_gallery_classname );

// --gallery-block--gutter-size is deprecated. --wp--style--gallery-gap-default should be used by themes that want to set a default
	// gap on the gallery.
	$fallback_gap = 'var( --wp--style--gallery-gap-default, var( --gallery-block--gutter-size, var( --wp--style--block-gap, 0.5em ) ) )';
	$gap_value    = $gap ? $gap : $fallback_gap;
	$gap_column   = $gap_value;

if ( is_array( $gap_value ) ) {
		$gap_row    = $gap_value['top'] ?? $fallback_gap;
		$gap_column = $gap_value['left'] ?? $fallback_gap;
		$gap_value  = $gap_row === $gap_column ? $gap_row : $gap_row . ' ' . $gap_column;
	}

// The unstable gallery gap calculation requires a real value (such as `0px`) and not `0`.
	if ( '0' === $gap_column ) {
		$gap_column = '0px';
	}

// Set the CSS variable to the column value, and the `gap` property to the combined gap value.
	$gallery_styles = array(
		array(
			'selector'     => ".wp-block-gallery.{$unique_gallery_classname}",
			'declarations' => array(
				'--wp--style--unstable-gallery-gap' => $gap_column,
				'gap'                               => $gap_value,
			),
		),
	);

wp_style_engine_get_stylesheet_from_css_rules(
		$gallery_styles,
		array( 'context' => 'block-supports' )
	);

// The WP_HTML_Tag_Processor class calls get_updated_html() internally
	// when the instance is treated as a string, but here we explicitly
	// convert it to a string.
	$updated_content = $processed_content->get_updated_html();

/*
	 * Randomize the order of image blocks. Ideally we should shuffle
	 * the `$parsed_block['innerBlocks']` via the `render_block_data` hook.
	 * However, this hook doesn't apply inner block updates when blocks are
	 * nested.
	 * @todo In the future, if this hook supports updating innerBlocks in
	 * nested blocks, it should be refactored.
	 *
	 * @see: https://github.com/WordPress/gutenberg/pull/58733
	 */
	if ( ! empty( $attributes['randomOrder'] ) ) {
		// This pattern matches figure elements with the `wp-block-image`
		// class to avoid the gallery's wrapping `figure` element and
		// extract images only.
		$pattern = '/<figure[^>]*\bwp-block-image\b[^>]*>.*?<\/figure>/s';

preg_match_all( $pattern, $updated_content, $matches );
		if ( $matches ) {
			$image_blocks = $matches[0];
			shuffle( $image_blocks );

$i               = 0;
			$updated_content = preg_replace_callback(
				$pattern,
				static function () use ( $image_blocks, &$i ) {
					return $image_blocks[ $i++ ];
				},
				$updated_content
			);
		}
	}

// Gets all image IDs from the state that match this gallery's ID.
	$state      = wp_interactivity_state( 'core/image' );
	$gallery_id = $block->context['galleryId'] ?? null;
	$image_ids  = array();

// Extracts image IDs from state metadata that match the current gallery ID.
	if ( isset( $gallery_id ) && isset( $state['metadata'] ) ) {
		foreach ( $state['metadata'] as $image_id => $metadata ) {
			if ( isset( $metadata['galleryId'] ) && $metadata['galleryId'] === $gallery_id ) {
				$image_ids[] = $image_id;
			}
		}
	}

// If there are image IDs associated with this gallery, set interactivity
	// attributes and order metadata for lightbox navigation.
	if ( ! empty( $image_ids ) ) {
		$total          = count( $image_ids );
		$lightbox_index = 0;
		$processor      = new WP_HTML_Tag_Processor( $updated_content );
		$processor->next_tag();
		$processor->set_attribute( 'data-wp-interactive', 'core/gallery' );
		$processor->set_attribute(
			'data-wp-context',
			wp_json_encode(
				array( 'galleryId' => $gallery_id ),
				JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP
			)
		);
		while ( $processor->next_tag( 'figure' ) ) {
			$wp_key = $processor->get_attribute( 'data-wp-key' );
			if ( $wp_key && isset( $state['metadata'][ $wp_key ] ) ) {
				$alt = $state['metadata'][ $wp_key ]['alt'];
				wp_interactivity_state(
					'core/image',
					array(
						'metadata' => array(
							$wp_key => array(
								'customAriaLabel'        => empty( $alt )
									/* translators: %1$s: current image index, %2$s: total number of images */
									? sprintf( __( 'Enlarged image %1$s of %2$s' ), $lightbox_index + 1, $total )
									/* translators: %1$s: current image index, %2$s: total number of images, %3$s: Image alt text */
									: sprintf( __( 'Enlarged image %1$s of %2$s: %3$s' ), $lightbox_index + 1, $total, $alt ),
								/* translators: %1$s: current image index, %2$s: total number of images */
								'triggerButtonAriaLabel' => sprintf( __( 'Enlarge %1$s of %2$s' ), $lightbox_index + 1, $total ),
								'order'                  => $lightbox_index,
							),
						),
					)
				);
				++$lightbox_index;
			}
		}
		return $processor->get_updated_html();
	}

return $updated_content;
}

/**
 * Registers the `core/gallery` block on server.
 *
 * @since 5.9.0
 */
function register_block_core_gallery() {
	register_block_type_from_metadata(
		__DIR__ . '/gallery',
		array(
			'render_callback' => 'block_core_gallery_render',
		)
	);
}

add_action( 'init', 'register_block_core_gallery' );