APC UPS status read over network

apcupsd.php

<?php
function htons($i)
{
    return pack('n', $i);
}

function nstoh($d)
{
    $length = unpack('n', $d);
    return $length[1];
}


$fp = fsockopen("127.0.0.1", 3551, $errno, $errstr);
if (!$fp) {
    return;
}

stream_set_blocking($fp, 1);
stream_set_timeout($fp, 5);

fwrite($fp, htons(6), 2);
fwrite($fp, 'status', 6);

$status = '';
while (!feof($fp)) {
    $length = nstoh(fread($fp, 2));
    if ($length == 0) {
        break;
    }
    $status .= fread($fp, $length);
}
fclose($fp);

echo $status;