<?php
$term = trim(str_replace(' ', '', mb_strtolower($_GET['term'])));
$sql = "SELECT * FROM urunler WHERE REPLACE(LOWER(REPLACE(code, 'I', 'ı')), ' ', '') LIKE '%{$term}%'";
SELECT code FROM `urun` WHERE REPLACE(code, ' ', '') LIKE concat('%W79%')
deneyiniz