<?php
function getUserIP()
{
	$client  = @$_SERVER['HTTP_CLIENT_IP'];
	$forward = @$_SERVER['HTTP_X_FORWARDED_FOR'];
	$remote  = $_SERVER['REMOTE_ADDR'];

	if(filter_var($client, FILTER_VALIDATE_IP)){
		$ip = $client;
	}else if(filter_var($forward, FILTER_VALIDATE_IP)){
		$ip = $forward;
	}
	else{
		$ip = $remote;
	}
	return $ip;
}
$user_ip = getUserIP();
if($user_ip!="172.16.43.224"){
	echo "ไม่ใช่";
}else{
	echo "ใช่";
}
?>