query($check_sql);
if ($check_result->num_rows > 0) {
$registration_error = "Username already exists. Please choose a different one.";
} else {
$sql = "INSERT INTO User (vorname, nachname, username, password) VALUES ('$vorname', '$nachname', '$username', '$hashed_password')";
if ($conn->query($sql) === TRUE) {
$registration_success = "Registration successful! You can now login.";
} else {
$registration_error = "Error: " . $sql . "
" . $conn->error;
}
}
}
$conn->close();
?>
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