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<?php

// If ip comes from behind proxy server
function forwarded_ip() {
	$keys = array(
		'HTTP_X_FORWARDED_FOR',
		'HTTP_X_FORWARDED',
		'HTTP_FORWARDED_FOR',
		'HTTP_FORWARDED',
		'HTTP_CLIENT_IP',
		'HTTP_X_CLUSTER_CLIENT_IP'
	);
	foreach ($keys as $key) {
		if(isset($_SERVER[$key])) {
			$ip_array = explode(',', $_SERVER[$key]);
			foreach ($ip_array as $ip) {
				$ip = trim($ip);
				if(validate_ip($ip)) {
					return $ip;
				}
			}
		}
	}
	return '';
}
// Check is ip valid
function validate_ip($ip) {
	if(filter_var($ip, FILTER_VALIDATE_IP , FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE
	 | FILTER_FLAG_NO_RES_RANGE ) === false){
		return false;
	} else {
		return true;
	}
}

$forwarded_ip = forwarded_ip();
$remote_ip = $_SERVER['REMOTE_ADDR'];
$the_ip = "";

// Check and use ip, forwarded or remote
if($forwarded_ip != '') {
	 $the_ip = $forwarded_ip;
} else {
	$the_ip = $remote_ip;
}
echo $the_ip;