/**
* Create a new instance for the given IPv6 ddress
*
* @param string $addr The IPv6 address
*/
public function __construct($addr)
{
if (!IPv6Address::validate($addr)) {
throw new \InvalidArgumentException("Not a valid IPv6 address.");
}
$this->addr = $addr;
}
/**
* Checks if the give IPv6 Address is part of the subnet.
*
* @param string The IPv6 address to check
*/
public function isInSubnet($ipv6addr)
{
if (!IPv6Address::validate($ipv6addr)) {
throw new \InvalidArgumentException("Not a valid IPv6 address.");
}
$bytes_addr = unpack("n*", inet_pton($this->addr));
$bytes_test = unpack("n*", inet_pton($ipv6addr));
for ($i = 1; $i <= ceil($this->preflen / 16); $i++) {
$left = $this->preflen - 16 * ($i - 1);
$left = $left <= 16 ? $left : 16;
$mask = ~(0xffff >> $left) & 0xffff;
if (($bytes_addr[$i] & $mask) != ($bytes_test[$i] & $mask)) {
return false;
}
}
return true;
}
