Remove all WooCommerce billing fields for virtual products

The following code checks to see if there are virtual products in the cart — if so, it will remove the billing fields from the WooCommerce checkout page as it is no longer needed. If there is at least one single physical item in the cart, though (mixed cart), then it keeps all the billing fields. If the cart is only physical products, no billing fields are removed.

add_filter( 'woocommerce_checkout_fields' , 'woo_remove_billing_checkout_fields' );

function woo_remove_billing_checkout_fields( $fields ) { 

if( wc_cart_has_virtual_products() == true ) {

  unset( $fields['billing']['billing_first_name'] );
  unset( $fields['billing']['billing_last_name'] );
  unset( $fields['billing']['billing_email'] );
  unset( $fields['billing']['billing_company']);
  unset( $fields['billing']['billing_address_1']);
  unset( $fields['billing']['billing_address_2']);
  unset( $fields['billing']['billing_city']);
  unset( $fields['billing']['billing_postcode']);
  unset( $fields['billing']['billing_country']);
  unset( $fields['billing']['billing_state']);
  unset( $fields['billing']['billing_phone']);
  unset( $fields['order']['order_comments']);
  unset( $fields['billing']['billing_address_2']);
  unset( $fields['billing']['billing_postcode']);
  unset( $fields['billing']['billing_company']);
  unset( $fields['billing']['billing_city']);
  }

return $fields; 

}

function wc_cart_has_virtual_products() { 

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 ID and '_virtual' post meta
    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;
}

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