MY_Input ip_address while under ELB

gistfile1.aw

<?php
class MY_Input extends CI_Input {

    function __construct()
    {
        parent::__construct();
    }
    
    /**
	* Fetch the IP Address
	* 
	* @access	public
	* @return	string
	*
	* UPDATED TO RETRIEVE UNDERNEATH AMAZON ELB
	*/
	function ip_address()
	{
		if ($this->ip_address !== FALSE)
		{
			return $this->ip_address;
		}

		if (config_item('proxy_ips') != '' && $this->server('HTTP_X_FORWARDED_FOR') && $this->server('REMOTE_ADDR'))
		{
			$proxies = preg_split('/[\s,]/', config_item('proxy_ips'), -1, PREG_SPLIT_NO_EMPTY);
			$proxies = is_array($proxies) ? $proxies : array($proxies);

			$this->ip_address = in_array($_SERVER['REMOTE_ADDR'], $proxies) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR'];
		}
		elseif ($this->server('REMOTE_ADDR') AND $this->server('HTTP_CLIENT_IP'))
		{
			$this->ip_address = $_SERVER['HTTP_CLIENT_IP'];
		}
		elseif ($this->server('REMOTE_ADDR'))
		{
			$this->ip_address = ($this->server('CLIENTIP')) ? $_SERVER['CLIENTIP'] : $_SERVER['REMOTE_ADDR'];
			// Ammended from:
			// $this->ip_address = $_SERVER['REMOTE_ADDR'];
			// Eg. use the CLIENTIP item that Amazon sets
		}
		elseif ($this->server('HTTP_CLIENT_IP'))
		{
			$this->ip_address = $_SERVER['HTTP_CLIENT_IP'];
		}
		elseif ($this->server('HTTP_X_FORWARDED_FOR'))
		{
			$this->ip_address = $_SERVER['HTTP_X_FORWARDED_FOR'];
		}

		if ($this->ip_address === FALSE)
		{
			$this->ip_address = '0.0.0.0';
			return $this->ip_address;
		}

		if (strpos($this->ip_address, ',') !== FALSE)
		{
			$x = explode(',', $this->ip_address);
			$this->ip_address = trim(end($x));
		}

		if ( ! $this->valid_ip($this->ip_address))
		{
			$this->ip_address = '0.0.0.0';
		}

		return $this->ip_address;
	}
}