proses

<?php
//mengkoneksian ke databese
$connect = new mysqli("localhost", "root", "", "test");

//menangkap data dari ajax
$username = $connect->real_escape_string($_POST['username']);
$email = $connect->real_escape_string($_POST['email']);
$password = $connect->real_escape_string($_POST['password']);

if (empty($username)) exit('input username');
if (empty($email)) exit('input email');
if (empty($password)) exit('input password');
if(strlen($password) < 5) exit('password is to short');

	$hash = password_hash($password, PASSWORD_DEFAULT);
  $sql = $connect->query("SELECT * FROM user WHERE email = '$email'");
  if ($sql->num_rows > 0) {
    exit("Already Exists");
  } else {
    $connect->query("INSERT INTO user
            VALUES('','$username','$email','$hash')");
    exit("Registration Success");
  }

  ?>