<?php
function shorthand_to_mask($shorthand) {
    $mask = array();
    for ($x=0; $x<4; $x++) {
        $binaryMask = "";
        for ($y=0; $y<8; $y++) {
            if ($shorthand-->0) {
                $binaryMask .= "1";
            }
            else {
                $binaryMask .= "0";
            }
        }
        $mask[$x] = intval(bindec($binaryMask));
    }
    return $mask;
}

function find_net($ip, $mask) {
    $net = array();
    for ($x=0; $x<4; $x++) {
        $net[$x] = $ip[$x] & $mask[$x];
    }
    return $net;
}

function first_host($ip, $mask) {
    $ip = find_net($ip, $mask);
    $ip[3]++;
    return $ip;
}

function last_host($ip, $mask) {
    $last = broadcast($ip, $mask);
    $last[3]--;
    return $last;
}

function broadcast($ip, $mask) {
    $ip = find_net($ip, $mask);
    $broadcast = array();
    for ($x=0; $x<4; $x++) {
        $temp_mask = "";
        $temp_mask2 = str_split(strval(decbin($mask[$x])));
        if (count($temp_mask2)==1) {
            $temp_mask = "11111111";
        }
        else {
            for ($y=0; $y<8; $y++) {
                if ($temp_mask2[$y]=="0") {
                    $temp_mask .= "1";
                }
                else {
                    $temp_mask .= "0";
                }
            }
        }
        $temp_mask = bindec($temp_mask);
        $broadcast[$x] = $temp_mask | $ip[$x];
    }
    return $broadcast;
}

function elaborate_mask($maskRaw) {
    $mask = explode(".", $maskRaw);
    for ($x=0; $x<4; $x++) {
        $mask[$x] = intval($mask[$x]);
    }
    return $mask;
}

function elaborate_ip($ipRaw) {
    return elaborate_mask($ipRaw);
}

function mask_to_raw($mask) {
    $maskRaw = "";
    for ($x=0; $x<4; $x++) {
        $maskRaw .= $mask[$x] . ".";
    }
    return substr($maskRaw, 0, -1);
}

function net_to_raw($net) {
    return mask_to_raw($net);
}


?>