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

18function render_block_core_post_featured_image( $attributes, $content, $block ) {19	if ( ! isset( $block->context['postId'] ) ) {20		return '';21	}22	$post_ID = $block->context['postId'];23 24	$is_link        = isset( $attributes['isLink'] ) && $attributes['isLink'];25	$size_slug      = isset( $attributes['sizeSlug'] ) ? $attributes['sizeSlug'] : 'post-thumbnail';26	$attr           = get_block_core_post_featured_image_border_attributes( $attributes );27	$overlay_markup = get_block_core_post_featured_image_overlay_element_markup( $attributes );28 29	if ( $is_link ) {30		if ( get_the_title( $post_ID ) ) {31			$attr['alt'] = trim( strip_tags( get_the_title( $post_ID ) ) );32		} else {33			$attr['alt'] = sprintf(34				// translators: %d is the post ID.35				__( 'Untitled post %d' ),36				$post_ID37			);38		}39	}40 41	$extra_styles = '';42 43	// Aspect ratio with a height set needs to override the default width/height.44	if ( ! empty( $attributes['aspectRatio'] ) ) {45		$extra_styles .= 'width:100%;height:100%;';46	} elseif ( ! empty( $attributes['height'] ) ) {47		$extra_styles .= "height:{$attributes['height']};";48	}49 50	if ( ! empty( $attributes['scale'] ) ) {51		$extra_styles .= "object-fit:{$attributes['scale']};";52	}53	if ( ! empty( $attributes['style']['shadow'] ) ) {54		$shadow_styles = wp_style_engine_get_styles( array( 'shadow' => $attributes['style']['shadow'] ) );55 56		if ( ! empty( $shadow_styles['css'] ) ) {57			$extra_styles .= $shadow_styles['css'];58		}59	}60 61	if ( ! empty( $extra_styles ) ) {62		$attr['style'] = empty( $attr['style'] ) ? $extra_styles : $attr['style'] . $extra_styles;63	}64 65	$featured_image = get_the_post_thumbnail( $post_ID, $size_slug, $attr );66 67	// Get the first image from the post.68	if ( $attributes['useFirstImageFromPost'] && ! $featured_image ) {69		$content_post = get_post( $post_ID );70		$content      = $content_post->post_content;71		$processor    = new WP_HTML_Tag_Processor( $content );72 73		/*74		 * Transfer the image tag from the post into a new text snippet.75		 * Because the HTML API doesn't currently expose a way to extract76		 * HTML substrings this is necessary as a workaround. Of note, this77		 * is different than directly extracting the IMG tag:78		 * - If there are duplicate attributes in the source there will only be one in the output.79		 * - If there are single-quoted or unquoted attributes they will be double-quoted in the output.80		 * - If there are named character references in the attribute values they may be replaced with their direct code points. E.g. `&hellip;` becomes `…`.81		 * In the future there will likely be a mechanism to copy snippets of HTML from82		 * one document into another, via the HTML Processor's `get_outer_html()` or83		 * equivalent. When that happens it would be appropriate to replace this custom84		 * code with that canonical code.85		 */86		if ( $processor->next_tag( 'img' ) ) {87			$tag_html = new WP_HTML_Tag_Processor( '<img>' );88			$tag_html->next_tag();89			foreach ( $processor->get_attribute_names_with_prefix( '' ) as $name ) {90				$tag_html->set_attribute( $name, $processor->get_attribute( $name ) );91			}92			$featured_image = $tag_html->get_updated_html();93		}94	}95 96	if ( ! $featured_image ) {97		return '';