Image

Hi there,

You can use the render_block filter to replace the featured image for a specific post everywhere except on the single post page itself.

Add this to your child theme’s functions.php or a code snippets plugin:

add_filter( 'render_block', function( $block_content, $block ) {
    if ( empty( $block['blockName'] ) || $block['blockName'] !== 'generateblocks/container' ) {
        return $block_content;
    }

    $post_id = YOUR_POST_ID; // Replace with your post ID
    $thumbnail_id = get_post_thumbnail_id( $post_id );
    $thumbnail_url = wp_get_attachment_url( $thumbnail_id );

    if ( ! $thumbnail_url || strpos( $block_content, $thumbnail_url ) === false ) {
        return $block_content;
    }

    if ( get_the_ID() !== $post_id || is_single( $post_id ) ) {
        return $block_content;
    }

    $new_url = 'https://example.com/your-custom-image.jpg'; // Replace with your custom image URL

    return str_replace( $thumbnail_url, $new_url, $block_content );
}, 10, 2 );

Replace YOUR_POST_ID with the ID of the post, and update the custom image URL.

Hi there,

The search results use a different template to display the featured image, so you’ll need a second filter to cover that. Here’s an updated version that handles both and supports multiple posts:

// For Loop Templates (background images in GB containers)
add_filter( 'render_block', function( $block_content, $block ) {
    if ( empty( $block['blockName'] ) || $block['blockName'] !== 'generateblocks/container' ) {
        return $block_content;
    }

    $replacements = array(
        123 => 'https://example.com/custom-image-1.jpg',
        456 => 'https://example.com/custom-image-2.jpg',
    );

    $current_id = get_the_ID();

    if ( ! isset( $replacements[ $current_id ] ) || is_single( $current_id ) ) {
        return $block_content;
    }

    $thumbnail_url = wp_get_attachment_url( get_post_thumbnail_id( $current_id ) );

    if ( ! $thumbnail_url || strpos( $block_content, $thumbnail_url ) === false ) {
        return $block_content;
    }

    return str_replace( $thumbnail_url, $replacements[ $current_id ], $block_content );
}, 10, 2 );

// For default blog/search output
add_filter( 'post_thumbnail_html', function( $html, $post_id ) {
    $replacements = array(
        123 => 'https://example.com/custom-image-1.jpg',
        456 => 'https://example.com/custom-image-2.jpg',
    );

    $post_id = absint( $post_id );

    if ( ! isset( $replacements[ $post_id ] ) || is_single( $post_id ) ) {
        return $html;
    }

    $thumbnail_url = wp_get_attachment_url( get_post_thumbnail_id( $post_id ) );

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

    return str_replace( $thumbnail_url, $replacements[ $post_id ], $html );
}, 10, 2 );

Replace the post IDs and URLs in the $replacements arrays with your own.