$name = htmlspecialchars($_POST['nameuserac']);
$color = htmlspecialchars($_POST['color']);
$adress = htmlspecialchars($_POST['adress']);
$tel = htmlspecialchars($_POST['tel']);
var_dump($name);
var_dump($color);
var_dump($adress);
var_dump($tel);
$query = mysqli_query($con, "INSERT INTO sales (id, name, color, adress, tel) VALUES (``, `$name`, `$color`, `$adress`, `$tel`)");
var_dump($query);
$query = mysqli_query($con, "INSERT INTO sales (name, color, adress, tel) VALUES (`{$name}`, `{$color}`, `{$adress}`, `{$tel}`)");
if ( !$query )
{
var_dump(mysqli_error($con));
}