certo...
ho tolto tutto, ecco il codice:

codice:
<?php
    header("HTTP/1.0 404 Not Found");
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title></title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
    404
  </body>
</html>

Perché non va?