YouTube API: Get full playlist - php

Question

I'm trying to understand recursion :) Well, specifically fetching a full YouTube playlist using Google's PHP Client Library.
This is my function in my class called YTFunctions. It first gets called with a valid, authenticated YouTube_Service object and a playlistId. Then, it should theoretically call itself over and over again as long as the PlaylistItems response has a nextPageToken and then append that to its outputs which should contain all objects (videos) contained in the playlist. For some reason, it just return an empty array.
public static function getFullPlaylistByID($youtube, $playlistId, $pageToken) {
$params = array(
'maxResults' => 50,
'playlistId' => $playlistId,
);
if ($pageToken !== false) {
$params['pageToken'] = $pageToken;
}
$playlistResponse = $youtube->playlistItems->listPlaylistItems('snippet,contentDetails', $params);
error_log(count($playlistResponse['items']));
$playlistItems = $playlistResponse['items'];
if (isset($playlistResponse['nextPageToken'])) {
$playlistItems = array_merge($playlistItems, YTFunctions::getFullPlaylistByID($youtube,$playlistId, $playlistResponse['nextPageToken']));
} else {
}
return $playlistItems;
}
I am clearly missing something here, any help would be greatly appreciated.
Tobias Timpe

Answer 1

here my class that will get all playlistItems
<?php
class yt{
public $DEVELOPER_KEY = '{DEVELOPER_KEY}';
public $client;
public $youtube;
public function __construct(){
$this->client = new Google_Client();
$this->client->setDeveloperKey($this->DEVELOPER_KEY);
$this->youtube = new Google_YoutubeService($this->client);
}
public function getPlaylistItems($playlist, $maxResults, $nextPageToken = ''){
$params = array(
'playlistId' => $playlist,
'maxResults' => $maxResults,
);
// if $nextPageToken exist
if(!empty($nextPageToken)){
//insert $nextPageToken value into $params['pageToken']
$params['pageToken'] = $nextPageToken;
}
$youtubeFeed = $this->youtube->playlistItems->listPlaylistItems('id,snippet,contentDetails', $params);
// function for looping our feed and entry
$this->setFeed($youtubeFeed);
//check if nextPageToken are exist
if(!empty($youtubeFeed['nextPageToken'])){
$insert = $this->getPlaylistItems($playlist, $maxResults, $youtubeFeed['nextPageToken']);
// return to function if nextPageToken are exist
return $insert;
}
}
}
$yt = new yt();
?>
and than use our class
$yt->getPlaylistItems('PL0823049820348','25');