YouTube API与谷歌PHP SDK -响应JSON

对于我的最新项目，我需要从YouTube搜索的结果作为JSON字符串。我试图从这里修改官方样本的代码，使整个响应数组作为JSON返回，但JSON输出只包括一个结果，只有两个标签的结果

{"etag":"'"bvxF-DWHx1toJotsdJBeCm43SLs/Ti9GPWl-tTk2fzo_W4M7px11bPY '","eventId":空,"类型":"youtube # searchListResponse"、"nextPageToken":"CBkQAA"、"prevPageToken":空,"visitorId":零}

这就是我的代码:

<?php
header('Cache-Control: no-cache, must-revalidate');
header('Content-type: application/json');
if ($_GET['q'] && $_GET['maxResults']) {
require_once 'Google/Client.php';
require_once 'Google/Service/YouTube.php';
$DEVELOPER_KEY = 'not gonna reveal my key ;) ';
$client = new Google_Client();
$client->setDeveloperKey($DEVELOPER_KEY);
$youtube = new Google_Service_YouTube($client);
try 
{
    $searchResponse = $youtube->search->listSearch('id,snippet', array(
        'q' => $_GET['q'],
        'maxResults' => $_GET['maxResults'],
    ));
    print_r(json_encode($searchResponse));
} 
catch (Google_ServiceException $e) {
    $htmlBody .= sprintf('<p>A service error occurred: <code>%s</code></p>',
    htmlspecialchars($e->getMessage()));
} 
catch (Google_Exception $e) {
    $htmlBody .= sprintf('<p>An client error occurred: <code>%s</code></p>',
    htmlspecialchars($e->getMessage()));
    }
}
?>

最后我希望有这样的东西

    {
 "kind": "youtube#searchListResponse",
 "etag": "'"bvxF-DWHx1toJotsdJBeCm43SLs/vL7IQMNuL84nujDqKdOtwOPpBkc'"",
 "nextPageToken": "CAIQAA",
 "pageInfo": {
  "totalResults": 203164,
  "resultsPerPage": 2
 },
 "items": [
  {
   "kind": "youtube#searchResult",
   "etag": "'"bvxF-DWHx1toJotsdJBeCm43SLs/m4lAJ1Qx-hvZpw4Uc9qSo_rqy5o'"",
   "id": {
    "kind": "youtube#video",
    "videoId": "UyI4v5sxT54"
   },
   "snippet": {
    "publishedAt": "2014-04-14T10:21:21.000Z",
    "channelId": "UCpDJl2EmP7Oh90Vylx0dZtA",
    "title": "BORGORE & SIKDOPE - Unicorn Zombie Apocalypse (Original Mix)",
    "description": "BORGORE teams up with SIKDOPE to bring you the main stage rocker that is Unicorn Zombie Apocalypse. Grab your copy NOW : http://btprt.dj/1hFUQhP ...",
    "thumbnails": {
     "default": {
      "url": "https://i.ytimg.com/vi/UyI4v5sxT54/default.jpg"
     },
     "medium": {
      "url": "https://i.ytimg.com/vi/UyI4v5sxT54/mqdefault.jpg"
     },
     "high": {
      "url": "https://i.ytimg.com/vi/UyI4v5sxT54/hqdefault.jpg"
     }
    },
    "channelTitle": "SpinninRec",
    "liveBroadcastContent": "none"
   }
  },
  {
   "kind": "youtube#searchResult",
   "etag": "'"bvxF-DWHx1toJotsdJBeCm43SLs/4LQaEODdVEec6exNA21SnYJAeOU'"",
   "id": {
    "kind": "youtube#video",
    "videoId": "CPXv392pc9k"
   },
   "snippet": {
    "publishedAt": "2014-05-16T23:00:00.000Z",
    "channelId": "UCpDJl2EmP7Oh90Vylx0dZtA",
    "title": "Borgore & Sikdope - Unicorn Zombie Apocalypse (Official Music Video)",
    "description": "Borgore & Sikdope present Unicorn Zombie Apocalypse (Official Music Video). Download your copy on Beatport HERE : http://btprt.dj/1hFUQhP English ...",
    "thumbnails": {
     "default": {
      "url": "https://i.ytimg.com/vi/CPXv392pc9k/default.jpg"
     },
     "medium": {
      "url": "https://i.ytimg.com/vi/CPXv392pc9k/mqdefault.jpg"
     },
     "high": {
      "url": "https://i.ytimg.com/vi/CPXv392pc9k/hqdefault.jpg"
     }
    },
    "channelTitle": "SpinninRec",
    "liveBroadcastContent": "none"
   }
  }
 ]
}