register-proses.php

<?php
require 'koneksi.php';
$username = $_POST['username'];
$email = $_POST['email'];
$password = $_POST['password'];

$sql_syntax = "insert into user (id, username, email, password) values (NULL, '$username', '$email', '$password')";
$mysql_query = mysqli_query(koneksi,$sql_syntax);

if ($mysqli_query) {
    echo "registrasi berhasil";
}else{
    echo "registrasi gagal";
}
?>