$query =   "UPDATE products
            SET products_reference='$varenummer', products_price='$pris'
            WHERE products_id='$id';";

            for ($x = 1; $x <= $amountOfLanguages; $x++) {
                $varenavn = $_POST["varenavn-" . $x];
                $korttekst = $_POST["korttekst-" . $x];
                $langtekst = $_POST["langtekst-" . $x];

                $query .=  "IF EXISTS (SELECT * FROM products_description WHERE products_id='$id' AND languages_id='$x')
                                UPDATE products_description
                                SET products_description_name='$varenavn', products_description_short_description='$korttekst', products_description_description='$langtekst'
                                WHERE products_id='$id'
                                AND languages_id='$x'
                            ELSE
                                INSERT INTO products_description (products_id, languages_id, products_description_name, products_description_short_description, products_description_description)
                                VALUES ('$id', '$x', '$varenavn', '$korttekst', '$langtekst');";
            }

            if ($conn->multi_query($query) === TRUE) {
                //header("Location: ./");
                //die();
                echo "done";
            } else {
                echo "Error: " . $query . "<br>" . $conn->error;
            }