// Gets user entered details from form.
if (isset($_POST['username'])) {
  $username=$_POST['username'];
} else {
  $username=null;
}
if (isset($_POST['rawpassword'])) {
  $rawpassword=$_POST['rawpassword'];
} else {
  $rawpassword=null;
}

// Hashes password through SHA-1.
$password = sha1($rawpassword);

echo "$username";
echo "$rawpassword";
echo "$password";

if (isset($_POST['']))

if (!isset($_POST['']))