my database field (id,username,password,user_type)

<?php
if($_SERVER['REQUEST_METHOD']=='POST'){

include 'Config.php';

 $con = mysqli_connect($HostName,$HostUser,$HostPass,$DatabaseName);

 $username = $_POST['username'];
 $password = $_POST['password'];
 $user_type = $_POST['user_type'];


 $CheckSQL = "SELECT * FROM Login WHERE email='$email'";

 $check = mysqli_fetch_array(mysqli_query($con,$CheckSQL));

 if(isset($check)){

 echo 'Sorry Email Already Exist';

 }
else{
$Sql_Query = "INSERT INTO Login (username,password,user_type) values ('$email','$password','$user_type')";

 if(mysqli_query($con,$Sql_Query))
{
 echo 'Registration Successfully';
}
else
{
 echo 'Error Something Wrong';
 }
 }
}
 mysqli_close($con);
?>