PHP class to retrieve WHOIS information.
<?php
$domain = 'uol.com.br';
$whois = new Phois\Whois\Whois($domain);
$whois_answer = $whois->info();
$nsServers = $whois->getNsServers();
echo $whois_answer;
if ($whois->isAvailable()) {
echo "Domain is available\n";
} else {
echo "Domain is registered\n";
}