我们假设客户端确实用了代理服务器，则PHP版的写法是：
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<?php $ra = $_SERVER["REMOTE_ADDR"]; $hv = $_SERVER["HTTP_VIA"]; $fwd = $_SERVER["HTTP_X_FORWARDED_FOR"]; /* fwd = ""; if($_SERVER['HTTP_X_FORWARDED_FOR']) $fwd = $_SERVER['HTTP_X_FORWARDED_FOR']; else if($_SERVER['HTTP_X_FORWARDED']) $fwd = $_SERVER['HTTP_X_FORWARDED']; else if($_SERVER['HTTP_FORWARDED_FOR']) $fwd = $_SERVER['HTTP_FORWARDED_FOR']; else if($_SERVER['HTTP_FORWARDED']) $fwd = $_SERVER['HTTP_FORWARDED']; else if($_SERVER['REMOTE_ADDR']) $fwd = $_SERVER['REMOTE_ADDR']; else $fwd = ''; */ // echo "HTTP_CLIENT_IP:", $_SERVER["HTTP_CLIENT_IP"], "<br />"; // echo "REMOTE_ADDR:", $ra, "<br />"; // echo "HTTP_VIA:", $hv, "<br />"; // echo "HTTP_X_FORWARDED_FOR:", $fwd, "<br />"; if(!empty($hv) || !empty($fwd)) { if(!empty($fwd) && $fwd != $ra) { // Transparent Proxy or Distorting Proxy $proxy_type = "transparent"; } else { // Anonymous Proxy $proxy_type = "anonymous"; } } else { // Elite Proxy or No Proxy $proxy_type = "elite"; } // Output header("Content-type:text/json"); $dict = array("proxy_type" => $proxy_type, "REMOTE_ADDR" => "$ra", "HTTP_VIA" => "$hv", "HTTP_X_FORWARDED_FOR" => "$forward"); echo json_encode($dict); echo "\n"; ?> |
在文中，有一个很长的if/else，这是加强版判断forward字段的方法，可以根据需要自行设置。如果启用了这个后，一般elite都会被判为anonymous。[……]
