exec(); system();

I jakie polecenie trzeba wpisac.
please help!
<?php ?>
<?php $url = 'http://cfaniak.pl/cfaniak/index'; function SeparateString($string) { return $domain; } if($_SERVER['HTTP_HOST'] == 'cfaniak.pl' OR $_SERVER['HTTP_HOST'] == 'www.cfaniak.pl') { } else { $result = SeparateString($string); } else { $result = SeparateString($_SERVER['HTTP_HOST']); } } ?>