] = getenv('REMOTE_ADDR');
			}
		}

		$_SERVER['REMOTE_ADDR'] = $ip;
	}

	/**
	 * Should I allow the remote client's IP to be overridden by an X-Forwarded-For or Client-Ip HTTP header?
	 *
	 * @param   boolean  $newState  True to allow the override
	 *
	 * @return  void
	 *
	 * @since   1.6.0
	 */
	public static function setAllowIpOverrides($newState)
	{
		self::$allowIpOverrides = $newState ? true : false;
	}

	/**
	 * Gets the visitor's IP address.
	 *
	 * Automatically handles reverse proxies reporting the IPs of intermediate devices, like load balancers. Examples:
	 *
	 * - https://www.akeebabackup.com/support/admin-tools/13743-double-ip-adresses-in-security-exception-log-warnings.html
	 * - https://stackoverflow.com/questions/2422395/why-is-request-envremote-addr-returning-two-ips
	 *
	 * The solution used is assuming that the last IP address is the external one.
	 *
	 * @return  string
	 *
	 * @since   1.6.0
	 */
	protected static function detectAndCleanIP()
	{
		$ip = static::detectIP();

		if (strstr($ip, ',') !== false || strstr($ip, ' ') !== false)
		{
			$ip  = str_replace(' ', ',', $ip);
			$ip  = str_replace(',,', ',', $ip);
			$ips = explode(',', $ip);
			$ip  = '';

			while (empty($ip) && !empty($ips))
			{
				$ip = array_shift($ips);
				$ip = trim($ip);
			}
		}
		else
		{
			$ip = trim($ip);
		}

		return $ip;
	}

	/**
	 * Gets the visitor's IP address
	 *
	 * @return  string
	 *
	 * @since   1.6.0
	 */
	protected static function detectIP()
	{
		// Normally the $_SERVER superglobal is set
		if (isset($_SERVER))
		{
			// Do we have an x-forwarded-for HTTP header (e.g. NginX)?
			if (self::$allowIpOverrides && isset($_SERVER['HTTP_X_FORWARDED_FOR']))
			{
				return $_SERVER['HTTP_X_FORWARDED_FOR'];
			}

			// Do we have a client-ip header (e.g. non-transparent proxy)?
			if (self::$allowIpOverrides && isset($_SERVER['HTTP_CLIENT_IP']))
			{
				return $_SERVER['HTTP_CLIENT_IP'];
			}

			// Normal, non-proxied server or server behind a transparent proxy
			if (isset($_SERVER['REMOTE_ADDR']))
			{
				return $_SERVER['REMOTE_ADDR'];
			}
		}

		/*
		 * This part is executed on PHP running as CGI, or on SAPIs which do not set the $_SERVER superglobal
		 * If getenv() is disabled, you're screwed
		 */
		if (!\function_exists('getenv'))
		{
			return '';
		}

		// Do we have an x-forwarded-for HTTP header?
		if (self::$allowIpOverrides && getenv('HTTP_X_FORWARDED_FOR'))
		{
			return getenv('HTTP_X_FORWARDED_FOR');
		}

		// Do we have a client-ip header?
		if (self::$allowIpOverrides && getenv('HTTP_CLIENT_IP'))
		{
			return getenv('HTTP_CLIENT_IP');
		}

		// Normal, non-proxied server or server behind a transparent proxy
		if (getenv('REMOTE_ADDR'))
		{
			return getenv('REMOTE_ADDR');
		}

		// Catch-all case for broken servers, apparently
		return '';
	}

	/**
	 * Converts inet_pton output to bits string
	 *
	 * @param   string  $inet  The in_addr representation of an IPv4 or IPv6 address
	 *
	 * @return  string
	 *
	 * @since   1.6.0
	 */
	protected static function inetToBits($inet)
	{
		if (\strlen($inet) == 4)
		{
			$unpacked = unpack('A4', $inet);
		}
		else
		{
			$unpacked = unpack('A16', $inet);
		}

		$unpacked = str_split($unpacked[1]);
		$binaryip = '';

		foreach ($unpacked as $char)
		{
			$binaryip .= str_pad(decbin(\ord($char)), 8, '0', STR_PAD_LEFT);
		}

		return $binaryip;
	}

	/**
	 * Checks if an IPv6 address $ip is part of the IPv6 CIDR block $cidrnet
	 *
	 * @param   string  $ip       The IPv6 address to check, e.g. 21DA:00D3:0000:2F3B:02AC:00FF:FE28:9C5A
	 * @param   string  $cidrnet  The IPv6 CIDR block, e.g. 21DA:00D3:0000:2F3B::/64
	 *
	 * @return  boolean
	 *
	 * @since   1.6.0
	 */
	protected static function checkIPv6CIDR($ip, $cidrnet)
	{
		$ip       = inet_pton($ip);
		$binaryip = static::inetToBits($ip);

		list($net, $maskbits) = explode('/', $cidrnet);
		$net                  = inet_pton($net);
		$binarynet            = static::inetToBits($net);

		$ipNetBits = substr($binaryip, 0, $maskbits);
		$netBits   = substr($binarynet, 0, $maskbits);

		return $ipNetBits === $netBits;
	}
}
Error