获得客户端真实的IP地址
function GetIP(){ if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")) $ip = getenv("HTTP_CLIENT_IP"); else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) $ip = getenv("HTTP_X_FORWARDED_FOR"); else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) $ip = getenv("REMOTE_ADDR"); else if (isset($_SERVER[REMOTE_ADDR]) && $_SERVER[REMOTE_ADDR] && strcasecmp($_SERVER[REMOTE_ADDR], "unknown")) $ip = $_SERVER[REMOTE_ADDR]; else $ip = "unknown"; return($ip); } 即使用户通过代理服务器上网，也能查出他的IP。但是要求代理服务器的类型是transparent类型。如果代理服务器是anonymous或者是high anonymous类型，HTTP_X_FORWARDED_FOR也无能为力了。
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