에러 관련 질문 채택완료

<?phpclass NaverProxy {      public function queryNaver($query, $target) {   $client_id = "ㅁㅁㅁ";  $client_secret = "ㅂㅂㅂ";   $query=urlencode("얍얍");  $target="blog";  $url = "https://openapi.naver.com/v1/search/blog.xml";  $url = sprintf("%s?query=%s&display=100&start=1&sort=sim&target=blog",  $url, $query);  $is_post = true;    $ch = curl_init();  curl_setopt($ch, CURLOPT_URL, $url);//  curl_setopt($ch, CURLOPT_GET, $is_post);  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);    $headers = array();  $headers[] = "X-Naver-Client-Id: ".$client_id;  $headers[] = "X-Naver-Client-Secret: ".$client_secret;    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);    $data = curl_exec ($ch);  curl_close ($ch);    return $data;      } } $naverproxy = new NaverProxy(); // XML파일에서 원하는 항목만 추출하기//echo $naverproxy -> queryNaver($_POST['query'], $_POST['target']);$xmlstring = $naverproxy -> queryNaver($_POST['query'], $_POST['target']); $xml = simplexml_load_string($xmlstring) or die("에러: 객체를 생성할 수 없습니다");$items = $xml->channel->item;if(!empty($items)){foreach($items as $item){    echo '<a href="' . $item->link . '">' . $item->title . '</a><br>';}} ?>