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终于写出个有用的东西了！
能够检测大部分通过代理服务器访问的ip.
<？php  
//beiji.com   2000.6.17  
$ip = getenv（"REMOTE_ADDR"）;  
$v = getenv（"HTTP_VIA"）;  
$f = getenv（"HTTP_X_FORWARDED_FOR"）;  
$c = getenv（"HTTP_XROXY_CONNECTION"）;  
$o = getenv（"HTTP_PRAGMA"）;  

print "<br>REMOTE_ADDR";  
print $ip;  

if （（$v==""）&&（$f==""）&&（$c==""）&&（$o==""））{  
print "<br>not through proxy";  
}  
else {  
print "<br>through proxy";  
print "<br>http_via: ";print $v;  
print "<br>http_x_forwarded_for: ";print $f;  
print "<br>http_xroxy_connection: ";print $c;  
print "<br>http_pragma: ";print $o;  
}  
？>