Add External Link to Featured Image with Custom Field

Add External Link to Featured Image with Custom Field

// Add External Link to Featured Image with Custom Field

add_filter('post_thumbnail_html','add_external_link_on_page_post_thumbnail',10);
    function add_external_link_on_page_post_thumbnail( $html ) {
    if( is_singular() ) {
            global $post;
            $name = get_post_meta($post->ID, 'ExternalUrl', true);
            if( $name ) {
                    $html = '<a href="' . ( $name ) . '" target="_blank" >' . $html . '</a>';
            }
    }
    return $html;
    }