How to implement opencart 2.0 product filter?

Question

PHP

Good evening, tell me how to implement filtering like on this site tastycoffeesale.ru/coffee where is the method of making coffee, so that instead of an inscription, just insert pictures

Answer 1

$query = "UPDATE `users` SET `type` = '".$type."' WHERE `users`.`user_id` = '".$id."'";
And still it is necessary to put protection against sql-injection

Answer 2

It's better to use an external one. For example mega filter

Answer 3

there is a FILTER field, use it, but this is the first IM where I meet such an implementation, third-party filters are usually used