php利用新浪接口查询ip获取地理位置

<?php
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;   
	}   
	$loc=iconv("UTF-8","gb2312",$loc);
	return $loc;
}
echo getIPLoc_sina("183.37.209.57");
?>