Untitled

<?php
$con = mysql_connect("localhost","root","");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }

if(empty($_POST['username'])){
   echo "Empty username!";
}

if(empty($_POST['password'])){
   echo "Empty password";
}


  mysql_select_db("users", $con);

mysql_query("INSERT INTO users (username, password )
VALUES ('$username', '$password')");

echo "Registration Succesful";

mysql_close($con);
?>


<!DOCTYPE html>
<html>
<body>

<form action="">
Username: <input type="text" name="username"><br>
Password: <input type="password" name="password"></form>


</body>
</html>