Show captions on featured images

Displays captions on featured images on archives and single posts.

add_filter( 'post_thumbnail_html', function( $html ) {

	if ( empty( $html ) ) {
		return $html;
	}

	if ( ! in_the_loop() ) {
		return $html;
	}

	global $post;
	$thumbnail_id = get_post_thumbnail_id( $post->ID );
	$thumbnail_image = get_posts(
		[ 'p' => $thumbnail_id, 'post_type' => 'attachment' ]
	);

	if ( $thumbnail_image && isset( $thumbnail_image[0] ) ) {
		$html = sprintf(
			'
				<div class="wp-block-image">
					<figure class="aligncenter">
						%s<figcaption>%s</figcaption>
					</figure>
				</div>
			',
			$html, $thumbnail_image[0]->post_excerpt
		);
	}

	return $html;

} );

Instructions for Show captions on featured images

Log into a staging or locally hosted clone of your site.
Install and activate Code Snippets plugin.
WP Admin > Snippets > Add New
Copy and paste the code from the section above.
Check to ensure formatting came over properly.
Customize the code as desired.
Add a meaningful title.
Select whether to run on front-end or back-end (or both).
Click “Save and Activate”.
Test your site to ensure it works.
Disable if any problems, or recover.
Repeat for live environment.

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License

All code snippets are licensed GPLv2 (or later) matching WordPress licensing.

Except when otherwise stated in writing the copyright holders and/or other parties provide the program as-is without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.
Disclaimer of warranty

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