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;  }  ?>