php根据经纬度获取城市名

/*php根据经纬度获取城市名*/
function get_my_addr_infos(){
    $ch = curl_init();
    $timeout = 5;
    $lat = $list['info']['lat']; //维度
    $lng = $list['info']['lng']; //经度
    $URL = "http://api.map.baidu.com/geocoder/v2/?ak=hLze6N9cRxKwgugGZ2IOmc1n&location=$lat,$lng&output=json&pois=0";
    curl_setopt ($ch, CURLOPT_URL, $URL);
    curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
    $file_contents = curl_exec($ch);
    curl_close($ch);
    $positon_add = json_decode($file_contents,true);
    $positon_addr_detail = ($positon_add['result']['formatted_address']) ? $positon_add['result']['formatted_address'] : "定位不准确，地图上没该地方";
    return $positon_addr_detail;
}