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Standalone View

				<?php

				/**
				* Represent and manipulate IP addresses.
				*
				* NOTE: This class only supports IPv4 for now.
				*/
				final class PhutilIPAddress extends Phobject {

				private $ip;
				private $bits;

				private function __construct() {
				// <private>
				}

				public static function newAddress($in) {
				if ($in instanceof PhutilIPAddress) {
				return $in;
				}

				return self::newFromString($in);
				}

				private static function newFromString($str) {
				$matches = null;
				$ok = preg_match('(^(\d+)\.(\d+)\.(\d+).(\d+)\z)', $str, $matches);
				if (!$ok) {
				throw new Exception(
				pht(
				'IP address "%s" is not properly formatted. Expected an IP '.
				'address like "23.45.67.89".',
				$str));
				}

				$parts = array_slice($matches, 1);
				foreach ($parts as $part) {
				if (preg_match('/^0\d/', $part)) {
				throw new Exception(
				pht(
				'IP address "%s" is not properly formatted. Address segments '.
				'should have no leading zeroes, but segment "%s" has a leading '.
				'zero.',
				$str,
				$part));
				}

				$value = (int)$part;
				if ($value < 0 \|\| $value > 255) {
				throw new Exception(
				pht(
				'IP address "%s" is not properly formatted. Address segments '.
				'should be between 0 and 255, inclusive, but segment "%s" has '.
				'a value outside of this range.',
				$str,
				$part));
				}
				}

				$obj = new PhutilIPAddress();
				$obj->ip = $str;

				return $obj;
				}

				public function toBits() {
				if ($this->bits === null) {
				$bits = '';
				foreach (explode('.', $this->ip) as $part) {
				$value = (int)$part;
				for ($ii = 7; $ii >= 0; $ii--) {
				$mask = (1 << $ii);
				if (($value & $mask) === $mask) {
				$bits .= '1';
				} else {
				$bits .= '0';
				}
				}
				}

				$this->bits = $bits;
				}

				return $this->bits;
				}

				}