Check if the WooCommerce cart contains virtual product

woo_cart_has_virtual_product.php

<?php
/**
 * Check if the cart contains virtual product
 *
 * @return bool
*/
function woo_cart_has_virtual_product(){
    global $woocommerce;

    // By default, no virtual product
    $has_virtual_products = false;

    // Default virtual products number
    $virtual_products = 0;

    // Get all products in cart
    $products = $woocommerce->cart->get_cart();

    // Loop through cart products
    foreach ( $products as $product ) {

        // Get product variation ID or product ID
        if ( $product['variation_id'] ){
            $product_id = $product['variation_id'];
        }
        else {
            $product_id = $product['product_id'];
        }
        $is_virtual = get_post_meta( $product_id, '_virtual', true );

        // Update $has_virtual_product if product is virtual
        if ( $is_virtual == 'yes' ){
            $virtual_products += 1;
        }
    }

    if ( count($products) == $virtual_products ){
        $has_virtual_products = true;
    }

    return $has_virtual_products;
}