Remove quantity field from WooCommerce

If you have a product which is restricted to a single purchase, you will want to remove the quantity field and buttons. Ideal for voucher products which have specific address collection fields.

<?php
function custom_remove_all_quantity_fields( $return, $product ) {return true;}
add_filter( 'woocommerce_is_sold_individually','custom_remove_all_quantity_fields', 10, 2 );
?>