Discuz!开发之IP地址的解析方法

[php] view plain copy
function convertip($ip) {  
    $return = '';  
    if(preg_match("/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/", $ip)) {  
        $iparray = explode('.', $ip);  
        if($iparray[0] == 10 || $iparray[0] == 127 || ($iparray[0] == 192 && $iparray[1] == 168) || ($iparray[0] == 172 && ($iparray[1] >= 16 && $iparray[1] <= 31))) {  
            $return = '- LAN';  
        } elseif($iparray[0] > 255 || $iparray[1] > 255 || $iparray[2] > 255 || $iparray[3] > 255) {  
            $return = '- Invalid IP Address';  
        } else {  
            $tinyipfile = DISCUZ_ROOT.'./data/ipdata/tinyipdata.dat';  
            $fullipfile = DISCUZ_ROOT.'./data/ipdata/wry.dat';  
            if(@file_exists($tinyipfile)) {  
                $return = convertip_tiny($ip, $tinyipfile);  
            } elseif(@file_exists($fullipfile)) {  
                $return = convertip_full($ip, $fullipfile);  
            }  
        }  
    }  
    return $return;  
}  

[php] view plain copy
require_once libfile('function/misc');  
$city=convertip($_G['clientip']);  
echo $city;