PHP: Find Network and Broadcast for given IP and Subnet

find_network_test.php

#!/usr/bin/php
<?php

$input = new stdClass();
$input->ip = '70.71.72.73';
$input->netmask = '255.255.255.0';
$input->ip_int = ip2long($input->ip);
$input->netmask_int = ip2long($input->netmask);

// Network is a logical AND between the address and netmask
$input->network_int = $input->ip_int & $input->netmask_int;
$input->network = long2ip($input->network_int);

// Broadcast is a logical OR between the address and the NOT netmask
$input->broadcast_int = $input->ip_int | (~ $input->netmask_int);
$input->broadcast = long2ip($input->broadcast_int);

print_r($input);

/*
stdClass Object
(
    [ip] => 70.71.72.73
    [netmask] => 255.255.255.0
    [ip_int] => 1179076681
    [netmask_int] => 4294967040
    [network_int] => 1179076608
    [network] => 70.71.72.0
    [broadcast_int] => -3115890433
    [broadcast] => 70.71.72.255
)
*/