Net_Portscan

require_once "Net_Portscan/Portscan.php";

if (Net_Portscan::checkPort("localhost", 80) == NET_PORTSCAN_SERVICE_FOUND) {
    echo "There is a service on localhost on port 80 (" . Net_Portscan::getService(80) . ").\n";
}

require_once "Net_Portscan/Portscan.php";

echo "Scanning localhost ports 70-90\n";
$result = Net_Portscan::checkPortRange("localhost", 70, 90);

foreach ($result as $port => $element) {
    if ($element == NET_PORTSCAN_SERVICE_FOUND) {
        echo "On port " . $port . " there is running a service.\n";
    } else {
        echo "On port " . $port . " there is no service running.\n";
    }
}