在PHP中过滤匿名代理与透明代理的方法

为了保护网站的资源，我们通常会不允许代理访问我们的网站，以下方法可以过滤掉所有匿名代理与透明代理，但不能过滤超级代理，同时他们过滤掉局域网的代理，所以如果要正常使用，可能还要做些必要的修改！
＄proxy = 0;
if(＄_SERVER['HTTP_VIA'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_X_FORWARDED_FOR'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['VIA'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_FORWARDED'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['FORWARDED'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_X_BLUECOAT_VIA'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_PROXY____'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_PROXY___________'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_PROXY_CONNECTION'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_X_HOST'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_X_REFERER'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_X_SERVER_HOSTNAME'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['PROXY_HOST'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['PROXY_PORT'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['PROXY_REQUEST'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_CLIENT_IP'] != "")
{ ＄proxy = 1; }
if(＄_SERVER['HTTP_PRAGMA'] != "")
{ ＄proxy = 1; }