Question

I have created one web application using PHP. I want know the IP randomly generated or not from proxy or client side application. Our application only allow one click per IP address.
I had checked the user agent by using $_SERVER['HTTP_USER_AGENT']. I got the user agent currently. but I want know whether the user agent using any other tool to generate IP address
dynamically. is it possible to check by using the code?

Answer 1

You can try this piece of code:

if (
      $_SERVER['HTTP_X_FORWARDED_FOR']
   || $_SERVER['HTTP_X_FORWARDED']
   || $_SERVER['HTTP_FORWARDED_FOR']
   || $_SERVER['HTTP_CLIENT_IP']
   || $_SERVER['HTTP_VIA']
   || in_array($_SERVER['REMOTE_PORT'], array(8080,80,6588,8000,3128,553,554))
   || @fsockopen($_SERVER['REMOTE_ADDR'], 80, $errno, $errstr, 30))
{
    exit('Proxy detected');
}

Source: digitalpoint