hi

i am adding a field "compatibility" to my query but everytime i m getting unexpected t_string error

PHP Code:
values('$unique_id',$order_id,'$username','$log_id','$shop_date','".$row['product_name'] . "' " . $row['quantity'] . "," . $row['shipping_cost'] . ",". $row['price'] .",". $row['total_cost']. ",". '"$row['compatibility'] . "'. ")"; 
help me remove this error. This field is "varchar".

vineet