register_user

$con = mysqli_connect(HOST, USER, PASSWORD, DB) or die("Unable to Connect");
$userName = $_GET['user_name'];
$userID = $_GET['user_id'];
$userPhone = $_GET['user_phone'];
$userPassword = $_GET['user_password'];
if($userName == '' || $userID == '' || $userPassword == ''){
	echo 'User Name, ID or Password can not be empty';
}else{
	$query = "select * from users where email = '$userID'";
	$recordExists = mysqli_fetch_array(mysqli_query($con, $query));
	if(isset($recordExists)){
		echo 'User already exists';
	}else{
		$query = "INSERT INTO users (name, email, phone, password) VALUES ('$userName', '$userID', '$userPhone', '$userPassword')";
		if(mysqli_query($con, $query)){
			echo 'User registered successfully';
		}else{
			echo 'oops! please try again!';
		}
	}
	mysqli_close($con);
}
?>