fsockopen的替代品-（非常慢）？

Question

Does anyone know an alternative to @fsockopen? I'm trying to detect proxies -- user hits site, grab users IP address, then use @fsockopen to see if they are using a specific port.Using this function is BY FAR the most reliable for detecting, outside of banning specific IPs / IP Patterns. However, it's very slow and un-acceptable for users visiting my site. Is there any other options, or a way to make it faster? And no setting the timeout of the function to 1 second doesn't help :P.

Example code:

 if ( $sock = @fsockopen($ _server['REMOTE_ADDR'], 80, $errno, $errst, 1) ) { echo "proxy!"; } 

Can curl achieve something like this?

Thanks in advance!

Answer 1

Test for $_SERVER['HTTP_X_FORWARDED_FOR'] :

$is_proxy = isset($_SERVER['HTTP_X_FORWARDED_FOR']);

It's faster and more accurate than your current method.