bbslogin.php中关于HTTP_X_FORWARDED_FOR是如下的
@$fullfromhost=$_SERVER["HTTP_X_FORWARDED_FOR"];
  if ($fullfromhost=="") {
      @$fullfromhost=$_SERVER["REMOTE_ADDR"];
      $fromhost=$fullfromhost;
  }
  else {
        $str = strrchr($fullfromhost, ",");
        if ($str!=FALSE)
                $fromhost=substr($str,1);
        else
                $fromhost=$fullfromhost;
  }
if ($fromhost=="")  {
  $fromhost="127.0.0.1";
  $fullfromhost="127.0.0.1";
怎样才能既保留这个过滤代理的功能，又避免出现unknown，甚至有人自己设定x_forwarded成127.0.0.1呢？
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FROM jiangjun