根据ip获取地理信息

function getIPLoc_sina($queryIP){    
$url = 'http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip='.$queryIP;    
$ch = curl_init($url);     
curl_setopt($ch,CURLOPT_ENCODING ,'utf8');     
curl_setopt($ch, CURLOPT_TIMEOUT, 5);   
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true) ; // 获取数据返回  
$location = curl_exec($ch);    
$location = json_decode($location);    
curl_close($ch);         
$loc = "";   
if($location===FALSE) return "";     
if (empty($location->desc)) {    
$loc = $location->province.$location->city.$location->district.$location->isp;  
}else{         $loc = $location->desc;    
}    
return $loc;
}
echo getIPLoc_sina("183.37.209.57");