WooCommerce Product Bundles - Check if cart contains a Product Bundle Container

functions.php

<?php
/**
 * Checks if the cart contains a product bundle
 * @return [bool]
 */
function cart_contains_product_bundle(){
	global $woocommerce;
	$contains_product_bundle = false;
	if ( sizeof( WC()->cart->get_cart() ) > 0 ) {
	    // if cart has items
	    foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
	        // loop through each cart item
	        if(wc_pb_is_bundle_container_cart_item($cart_item)){
	        	// if its a bundle container product
	        	$contains_product_bundle = true;
	        	return $contains_product_bundle;
	        }
	    }
	}
	return $contains_product_bundle;
}