ayuda con redireccionamiento 301

[initio]

Ahí va eso ...

public static function redireccion ($URL)
{
header("HTTP/1.1 301 Moved Permanently");
header("Status: 301 Moved Permanently");
header("Location: $URL");
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Mon, 01 Gen 2000 01:00:00 GMT");

return (exit(0));
}