remote_addr.php

<?php
	/* ... */

	protected static getRemoteIP() : string
	{
		if(isset($_SERVER['HTTP_X_FORWARDED_FOR']) && $_SERVER['HTTP_X_FORWARDED_FOR'])
		{
			return($_SERVER['HTTP_X_FORWARDED_FOR']);
		}
		elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'])
		{
			return($_SERVER['REMOTE_ADDR']);
		}
		
		throw new reCAPTCHAException('Unable to fetch remote IP.');
	}

	/* ... */

	/* ... */

	$ip = $this->ip ? $this->ip : self::getRemoteIP();

	/* ... */