Как получить полное описание видео с youtube с помощью Youtube API v3

<?php
define('GOOGLE_API_KEY', 'PASTE_YOUR_API_KEY');
 
function getYTList($api_url = '') {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $api_url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $response = curl_exec($ch);
    $arr_result = json_decode($response);
    if (isset($arr_result->items)) {
        return $arr_result;
    } elseif (isset($arr_result->error)) {
        //var_dump($arr_result); //this line gives you error info if you are not getting a video list.
    }
}

<?php
require_once "config.php";
 
$arr_list = array();
if (array_key_exists('channel', $_GET) && array_key_exists('max_result', $_GET)) {
    $channel = $_GET['channel'];
    $url = "https://www.googleapis.com/youtube/v3/search?channelId=$channel&order=date&part=snippet&type=video&maxResults=". $_GET['max_result'] ."&key=". GOOGLE_API_KEY;
    $arr_list = getYTList($url);
}
?>


  <form method="get">

    <p><input type="text" name="channel" placeholder="Enter Channel ID" value="<?php if(array_key_exists('channel', $_GET)) echo $_GET['channel']; ?>" required></p>

    <p><input type="number" name="max_result" placeholder="Max Results" min="1" max="50" value="<?php if(array_key_exists('max_result', $_GET)) echo $_GET['max_result']; ?>" required></p>

    <p><input type="submit" value="Submit"></p>
  </form>

  <?php
if (!empty($arr_list)) {
    echo '<ul class="video-list">';
    foreach ($arr_list->items as $yt) {
        echo "<li>". $yt->snippet->title ." (". $yt->id->videoId .")</li>";
    }
    echo '</ul>';
 
    if (isset($arr_list->nextPageToken)) {
        echo '<input type="hidden" class="nextpagetoken" value="'. $arr_list->nextPageToken .'" />';
        echo '<div id="loadmore">Load More</div>';
    }
}
?>

    <script>
      var httpRequest, nextPageToken;
      document.getElementById("loadmore").addEventListener('click', makeRequest);

      function makeRequest() {
        httpRequest = new XMLHttpRequest();
        nextPageToken = document.querySelector('.nextpagetoken').value;
        if (!httpRequest) {
          alert('Giving up: Cannot create an XMLHTTP instance');
          return false;
        }
        httpRequest.onreadystatechange = function() {
          if (this.readyState == 4 && this.status == 200) {
            var list = JSON.parse(this.responseText);
            for (var i in list) {
              if (list[i].title != undefined && list[i].id != undefined) {
                var newElement = document.createElement('li');
                newElement.innerHTML = '<li>' + list[i].title + '(' + list[i].id + ')</li>';
                document.querySelector('.video-list').appendChild(newElement);
              }
            }

            if (list[list.length - 1].nextPageToken != undefined) {
              document.querySelector('.nextpagetoken').value = list[list.length - 1].nextPageToken;
            } else {
              var loadmore = document.getElementById("loadmore");
              loadmore.parentNode.removeChild(loadmore);
            }
          }
        };
        httpRequest.open('GET', 'ajax.php?channel=<?php echo $_GET['
          channel ']; ?>&max_result=<?php echo $_GET['
          max_result ']; ?>&nextPageToken=' + nextPageToken, true);
        httpRequest.send();
      }
    </script>

<?php
require_once "config.php";
 
$url = "https://www.googleapis.com/youtube/v3/search?channelId=". $_GET['channel'] ."&order=date&part=snippet&type=video&maxResults=". $_GET['max_result'] ."&pageToken=". $_GET['nextPageToken'] ."&key=". GOOGLE_API_KEY;
 
$arr_list = getYTList($url);
 
$arr_result = array();
if (!empty($arr_list)) {
    foreach ($arr_list->items as $yt) {
        array_push($arr_result, ['title' => $yt->snippet->title, 'id' => $yt->id->videoId]);
    }
    if (isset($arr_list->nextPageToken)) {
        array_push($arr_result, ['nextPageToken' => $arr_list->nextPageToken]);
    }
}
 
echo json_encode($arr_result);

$string = file_get_contents("https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=UCuCQXqQLAQuTObCGlTYDE3w&maxResults=50&order=date&key=API_KEY_HERE&fields=nextPageToken,pageInfo,items(id(videoId),snippet(title,description,channelTitle,thumbnails(high(url))))");
$json_a = json_decode($string, true); foreach($json_a['items'] as $video)
{ 
  $description = file_get_contents("https://www.googleapis.com/youtube/v3/videos?part=snippet&id={$video['id']['videoId']}&key=API_KEY_HERE"); 
  $description = json_decode($description, true); 
  $description = $description['items'][0]['snippet']['description']; 
}