SELECT * FROM items WHERE (item_name LIKE '%".$v."%' OR item_description LIKE '%$v%' OR item_keywords LIKE '%$v%') ORDER BY item_id DESC
$v = strtolower($v)
SELECT * FROM items WHERE ( LOWER(item_name) LIKE %".$v."%' OR LOWER(item_description) LIKE '%$v%' OR LOWER(item_keywords) LIKE '%$v%' ) ORDER BY item_id DESC