render_block_core_image( array $attributes, string $content, WP_Block $block ): string

20function render_block_core_image( $attributes, $content, $block ) {21	if ( false === stripos( $content, '<img' ) ) {22		return '';23	}24 25	$processor = new class( $content ) extends WP_HTML_Tag_Processor {26		/**27		 * Return input span for an empty FIGCAPTION element.28		 *29		 * Returns span of input for an empty FIGCAPTION, if currently matched on a30		 * FIGCAPTION opening tag and if the element is properly closed and empty.31		 *32		 * @since 6.9.033		 *34		 * @return WP_HTML_Span|false Span of input if the element is empty; otherwise false.35		 */36		public function block_core_image_extract_empty_figcaption_element() {37			$this->set_bookmark( 'here' );38			$opener = $this->bookmarks['here'];39 40			// Allow comments within the definition of “empty.”41			while ( $this->next_token() && '#comment' === $this->get_token_name() ) {42				continue;43			}44 45			if ( 'FIGCAPTION' !== $this->get_tag() || ! $this->is_tag_closer() ) {46				return false;47			}48 49			$this->set_bookmark( 'here' );50			$closer = $this->bookmarks['here'];51 52			return new WP_HTML_Span( $opener->start, $closer->start + $closer->length - $opener->start );53		}54	};55 56	if ( ! $processor->next_tag( 'img' ) || ! $processor->get_attribute( 'src' ) ) {57		return '';58	}59 60	$has_id_binding = isset( $attributes['metadata']['bindings']['id'] ) && isset( $attributes['id'] );61 62	// Ensure the `wp-image-id` classname on the image block supports block bindings.63	if ( $has_id_binding ) {64		// If there's a mismatch with the 'wp-image-' class and the actual id, the id was65		// probably overridden by block bindings. Update it to the correct value.66		// See https://github.com/WordPress/gutenberg/issues/62886 for why this is needed.67		$id                       = $attributes['id'];68		$image_classnames         = $processor->get_attribute( 'class' );69		$class_with_binding_value = "wp-image-$id";70		if ( is_string( $image_classnames ) && ! str_contains( $image_classnames, $class_with_binding_value ) ) {71			$image_classnames = preg_replace( '/wp-image-(\d+)/', $class_with_binding_value, $image_classnames );72			$processor->set_attribute( 'class', $image_classnames );73		}74	}75 76	// For backwards compatibility, the data-id html attribute is only set for77	// image blocks nested in a gallery. Detect if the image is in a gallery by78	// checking the data-id attribute.79	// See the `block_core_gallery_data_id_backcompatibility` function.80	if ( isset( $attributes['data-id'] ) ) {81		// If there's a binding for the `id`, the `id` attribute is used for the82		// value, since `data-id` does not support block bindings.83		// Else the `data-id` is used for backwards compatibility, since84		// third parties may be filtering its value.85		$data_id = $has_id_binding ? $attributes['id'] : $attributes['data-id'];86		$processor->set_attribute( 'data-id', $data_id );87	}88 89	/*90	 * If the `caption` attribute is empty and we encounter a `<figcaption>` element,91	 * we take note of its span so we can remove it later.92	 */93	if ( $processor->next_tag( 'FIGCAPTION' ) && empty( $attributes['caption'] ) ) {94		$figcaption_span = $processor->block_core_image_extract_empty_figcaption_element();95	}96 97	$link_destination  = $attributes['linkDestination'] ?? 'none';98	$lightbox_settings = block_core_image_get_lightbox_settings( $block->parsed_block );99