<?
  if (isset($name)){
    echo "<h1>Hallo $vname $name</h1>\n";
    echo "Sie sind $alter Jahre alt\n";
    unset($name);
    exit;
  }

?>

<form action=test1.php3>
Name: <input type=text name=name><p>
Vorname: <input type=text name=vname><p>
Alter: <input type=text name=alter><p>
<input type=submit>
</form>