Show caption name

sunshine-show-caption

// Add this to your theme's functions.php file
// Or use this plugin https://wordpress.org/plugins/my-custom-functions/

// Show caption under thumbnail
add_filter( 'sunshine_image_name', 'sunshine_thumbnail_show_caption', 10, 2 );
function sunshine_thumbnail_show_caption( $caption, $image ) {
	if ( !empty( $image->post_excerpt ) ) {
		$caption = $image->post_excerpt;
	}
	return $caption;
}

// Show caption on single image page
add_filter( 'sunshine_after_image', 'sunshine_image_show_caption', 10 );
function sunshine_image_show_caption( $image_id ) {
	$image = get_post( $image_id );
	if ( !empty( $image->post_excerpt ) ) {
		echo $image->post_excerpt;
	}
}