Use Kadence lightbox for Blocksy post featured image

gistfile1.txt

/**
 * Enqueue the Kadence lightbox styles and scripts
 */
add_action('wp_enqueue_scripts', function() {
	if ( !is_plugin_active( 'kadence-blocks/kadence-blocks.php' ) ) { 
		return;
	} 

	if ( is_singular('post') ) {
		wp_enqueue_style('kadence-glightbox', KADENCE_BLOCKS_URL . 'includes/assets/css/kb-glightbox.min.css', array(), KADENCE_BLOCKS_VERSION);
		wp_enqueue_script('kadence-glightbox', KADENCE_BLOCKS_URL . 'includes/assets/js/glightbox.min.js', array(), KADENCE_BLOCKS_VERSION, true);
		wp_add_inline_script('kadence-glightbox', '
			window.addEventListener("DOMContentLoaded",function () {
				GLightbox({
					skin: "kadence-dark",
					openEffect: "fade",
					closeEffect: "fade"
				});
			});
		');
	}
});


/**
 * Make single post featured images a clickable lightbox using Kadence lightbox
 */
add_filter('post_thumbnail_html', function($html, $post_id, $post_thumbnail_id, $size, $attr) {
	if ( !is_plugin_active( 'kadence-blocks/kadence-blocks.php' ) ) {
		return;
	} 

	if ( is_singular('post') ) {
		$link = wp_get_attachment_image_url($post_thumbnail_id, 'full');
		$html = preg_replace('/(<img([^>]*)>)/i', '<a href="' . $link . '" class="glightbox" aria-label="Display this image in a lightbox">$1</a>', $html);
	}
	
	return $html;
}, 20, 5);