render_block_core_post_featured_image() │ WP 1.0

Renders the core/post-featured-image block on the server.

No Hooks.

Return

String. Returns the featured image for the current post.

Usage

render_block_core_post_featured_image( $attributes, $content, $block );

$attributes(array) (required)

Block attributes.

$content(string) (required)

Block default content.

$block(WP_Block) (required)

Block instance.

render_block_core_post_featured_image() render block core post featured image code ^{WP 6.5.2}

function render_block_core_post_featured_image( $attributes, $content, $block ) {
	if ( ! isset( $block->context['postId'] ) ) {
		return '';
	}
	$post_ID = $block->context['postId'];

	$is_link        = isset( $attributes['isLink'] ) && $attributes['isLink'];
	$size_slug      = isset( $attributes['sizeSlug'] ) ? $attributes['sizeSlug'] : 'post-thumbnail';
	$attr           = get_block_core_post_featured_image_border_attributes( $attributes );
	$overlay_markup = get_block_core_post_featured_image_overlay_element_markup( $attributes );

	if ( $is_link ) {
		if ( get_the_title( $post_ID ) ) {
			$attr['alt'] = trim( strip_tags( get_the_title( $post_ID ) ) );
		} else {
			$attr['alt'] = sprintf(
				// translators: %d is the post ID.
				__( 'Untitled post %d' ),
				$post_ID
			);
		}
	}

	$extra_styles = '';

	// Aspect ratio with a height set needs to override the default width/height.
	if ( ! empty( $attributes['aspectRatio'] ) ) {
		$extra_styles .= 'width:100%;height:100%;';
	} elseif ( ! empty( $attributes['height'] ) ) {
		$extra_styles .= "height:{$attributes['height']};";
	}

	if ( ! empty( $attributes['scale'] ) ) {
		$extra_styles .= "object-fit:{$attributes['scale']};";
	}

	if ( ! empty( $extra_styles ) ) {
		$attr['style'] = empty( $attr['style'] ) ? $extra_styles : $attr['style'] . $extra_styles;
	}

	$featured_image = get_the_post_thumbnail( $post_ID, $size_slug, $attr );

	// Get the first image from the post.
	if ( $attributes['useFirstImageFromPost'] && ! $featured_image ) {
		$content_post = get_post( $post_ID );
		$content      = $content_post->post_content;
		$processor    = new WP_HTML_Tag_Processor( $content );

		/*
		 * Transfer the image tag from the post into a new text snippet.
		 * Because the HTML API doesn't currently expose a way to extract
		 * HTML substrings this is necessary as a workaround. Of note, this
		 * is different than directly extracting the IMG tag:
		 * - If there are duplicate attributes in the source there will only be one in the output.
		 * - If there are single-quoted or unquoted attributes they will be double-quoted in the output.
		 * - If there are named character references in the attribute values they may be replaced with their direct code points. E.g. `…` becomes `…`.
		 * In the future there will likely be a mechanism to copy snippets of HTML from
		 * one document into another, via the HTML Processor's `get_outer_html()` or
		 * equivalent. When that happens it would be appropriate to replace this custom
		 * code with that canonical code.
		 */
		if ( $processor->next_tag( 'img' ) ) {
			$tag_html = new WP_HTML_Tag_Processor( '<img>' );
			$tag_html->next_tag();
			foreach ( $processor->get_attribute_names_with_prefix( '' ) as $name ) {
				$tag_html->set_attribute( $name, $processor->get_attribute( $name ) );
			}
			$featured_image = $tag_html->get_updated_html();
		}
	}

	if ( ! $featured_image ) {
		return '';
	}

	if ( $is_link ) {
		$link_target    = $attributes['linkTarget'];
		$rel            = ! empty( $attributes['rel'] ) ? 'rel="' . esc_attr( $attributes['rel'] ) . '"' : '';
		$height         = ! empty( $attributes['height'] ) ? 'style="' . esc_attr( safecss_filter_attr( 'height:' . $attributes['height'] ) ) . '"' : '';
		$featured_image = sprintf(
			'<a href="%1$s" target="%2$s" %3$s %4$s>%5$s%6$s</a>',
			get_the_permalink( $post_ID ),
			esc_attr( $link_target ),
			$rel,
			$height,
			$featured_image,
			$overlay_markup
		);
	} else {
		$featured_image = $featured_image . $overlay_markup;
	}

	$aspect_ratio = ! empty( $attributes['aspectRatio'] )
		? esc_attr( safecss_filter_attr( 'aspect-ratio:' . $attributes['aspectRatio'] ) ) . ';'
		: '';
	$width        = ! empty( $attributes['width'] )
		? esc_attr( safecss_filter_attr( 'width:' . $attributes['width'] ) ) . ';'
		: '';
	$height       = ! empty( $attributes['height'] )
		? esc_attr( safecss_filter_attr( 'height:' . $attributes['height'] ) ) . ';'
		: '';
	if ( ! $height && ! $width && ! $aspect_ratio ) {
		$wrapper_attributes = get_block_wrapper_attributes();
	} else {
		$wrapper_attributes = get_block_wrapper_attributes( array( 'style' => $aspect_ratio . $width . $height ) );
	}
	return "<figure {$wrapper_attributes}>{$featured_image}</figure>";
}