warum geht das nicht ?? Host Sperren

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<?php
require('./hostsperre.php');

if (getenv("HTTP_FORWARDED")!="") { 
$ip=getenv("HTTP_FORWARDED"); 
} elseif (getenv("HTTP_X_FORWARDED_FOR")!="") { 
$ip=getenv("HTTP_X_FORWARDED_FOR"); 
} elseif (getenv("HTTP_CLIENT_IP")!="") { 
$ip=getenv("HTTP_CLIENT_IP"); 
} else { 
$ip=getenv(REMOTE_ADDR);
} 
$host = gethostbyaddr($ip); 
if(in_array($host,$gesperrtehost)) 
{
        exit; 
} 

?>

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<?
$gesperrtehost = array(
".dip.t-dialin.net "
);
?>