$fname      = $_POST["fname"];
            $lname      = $_POST["lname"];
            $email      = $_POST["email"];
            $password   = $_POST["password"];
            $classes    = $_POST["classes"];
            $targets    = $_POST["targets"];

            //PREPARED STATEMENTS

            $sql = "INSERT INTO SHS_Lehrer (fname, lname, email, password, classes, targets) VALUES ($fname, $lname, $email, $password, $classes, $targets)";
if(!mysqli_query($con, $sql))
{
echo "error";
}