David Klhufek

Hi @adaptiman,

I’ve updated and tested the code, and it now correctly displays the caption under the featured image in the Single Post template. The issue with the HTML link in the caption has been fixed as well.

/**
 * Add caption (Description) to the featured image in the Single Post template only.
 */

function add_featured_image_caption( $block_content, $block ) {
    if ( is_single() && isset($block['blockName']) && 'core/post-featured-image' === $block['blockName'] && has_post_thumbnail() ) {
        $thumbnail_id = get_post_thumbnail_id(); // Get the featured image ID
        
        // Retrieve the correct caption (stored in the "Description" field)
        $attachment = get_post($thumbnail_id);
        $caption = !empty($attachment->post_content) ? $attachment->post_content : '';

        // Append the caption if it exists
        if ( ! empty( $caption ) ) {
            $block_content .= '<p class="featured-image-caption">' . wp_kses_post( $caption ) . '</p>';
        }
    }
    return $block_content;
}

add_filter( 'render_block', 'add_featured_image_caption', 10, 2 );

Try the updated version, and let me know if you need any further adjustments! 😊

Here is a solution to display the image caption for the featured image in the “Single Posts” template using WordPress filters. This will dynamically append the caption below the featured image. Copy and paste this code into your theme’s functions.php file or a Code Snippets plugin.

<?php
/**
 * Add caption to the featured image in Single Posts template.
 */

// Add a caption below the featured image
function add_featured_image_caption( $block_content, $block ) {
    // Check if the block is 'core/post-featured-image' and if the post has a featured image
    if ( 'core/post-featured-image' === $block['blockName'] && has_post_thumbnail() ) {
        $thumbnail_id = get_post_thumbnail_id(); // Get the featured image ID
        $caption = wp_get_attachment_caption( $thumbnail_id ); // Get the image caption

        // Append the caption to the block content if it exists
        if ( $caption ) {
            $block_content .= '<p class="featured-image-caption">' . esc_html( $caption ) . '</p>';
        }
    }
    return $block_content;
}

// Hook the function to the render_block filter
add_filter( 'render_block', 'add_featured_image_caption', 10, 2 );

Hi @badhonrocks

Today I tested version 4.0.7 and the bug is still there. The only version that works is 4.0.5

Hi, I am in trouble, after update to WP 4.0 Satellite Slideshows are in reverse order. Last photo is first..

Do you plan to fix it?