IPv4 classes for PHP5

Purpose

Identify, convert, and enumerate IPv4 IP addresses and subnets

Examples

$ip = Ipv4_Address::fromString('10.2.1.1');
$sn = Ipv4_Subnet::fromString('10.2.0.0/16');

// Test if IP is in subnet
$sn->contains($ip)          // true
$sn->contains('10.3.1.23')  // false
Ipv4_Subnet::ContainsAddress($sn,$ip)
Ipv4_Subnet::ContainsAddress('192.168.1.0/27','192.168.1.246')

// Test if two IPs are on the same network
$netmask = '255.255.255.0';
Ipv4_Subnet::ContainsAddress(new Ipv4_Subnet($ip1,$netmask),$ip2)

// Can be written in numerous ways...
Ipv4_Subnet::ContainsAddress("{$ip1}/24",$ip2)
Ipv4_Subnet::fromString("{$ip1}/24")->contains($ip2)

// Subnet information
$sn->getNetwork()
$sn->getNetmask()
$sn->getNetmaskCidr()
$sn->getFirstHostAddr()
$sn->getLastHostAddr()
$sn->getBroadcastAddr()

// Enumerate subnet addresses
$ips = $sn->getIterator();
foreach($ips as $addr) ...

// Count number of usable IPs on subnet (implements Countable)
$sn->getTotalHosts()
$sn->count()
count($sn)