Turn off a remote website wtih this script that 'calls home'. Great for those clients on remote servers that are making payments.
'killswitch.xml' will reside on your server. 'killswitch.php' resides on the remote server.
Update 'killswitch.php' w/ the URL of where your 'killswitch.xml' file will reside
private $xml = 'http://domain.com/killswitch.xml';
<another-site.com>
<status>false</status>
<message>Please contact me immediately.</message>
</another-site.com>
$check = new killswitch($_SERVER['HTTP_HOST']);
if($check->info->status == 'false')
exit($check->info->message);