Codeigniter谷歌地图api

我刚刚测试了GoogleMapsAPI到codeigniter，但出现了一个我不理解的错误。 严重性：通知 消息：未定义变量：map

代码来自这里

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您确定要加载“谷歌地图”库吗？类地图扩展了CI_控制器{function index（）{$this->load->library（'googlemaps'）；$config['center']='35.825795，10.607212'；$config['zoom']='auto'；$config['directions']=TRUE；$config['directionstart']='Sousse Railway'；$config['directionsEnd']='Sousse Sud'；$config['directionsDivID']='directionsDiv'；$this->googlemaps->initialize（$config）；$data['map']=$this->googlemaps->create_map（）；$this->load->view（'maps'，$data）；}

if (isset($_GET["w1"]) && isset($_GET["w2"]))
{
    $config['center'] = $lat = $_GET["w1"].','.$lng = $_GET["w2"];
    $marker = array();        
    $marker['position'] = $lat = $_GET["w1"].','.$lng = $_GET["w2"];
    $latlng = $_GET["w1"].','.$_GET["w2"];
    $request = file_get_contents('https://maps.googleapis.com/maps/api/geocode/json?address=.$latlng.&key=AIzaSyAOAR94QMB9YdE8RXHG-8NE28cz6wdUw2I');
    $json = json_decode($request, true);                                            
    $marker['infowindow_content'] = implode("|", $json);
    $this->googlemaps->add_marker($marker);             
}