Youtube.php

<?php 
require_once('libs/curl/curl.php'); // https://github.com/shuber/curl

class Youtube extends Curl 
{

	public $params = array(
		'key' => 'AIzaSyD2g6U5OzaLLvzEBBacZBhfaBIKeoZnKFM', // API Key
		'maxResults' => 50, // Max items in result set
		'part' => 'snippet' // https://developers.google.com/youtube/v3/getting-started#part
	);

	private $service_url;



	public function __construct()
	{
		parent::__construct();

	}


	function get_playlist($playlist_id)
	{
		$this->service_url = 'https://www.googleapis.com/youtube/v3/playlistItems';
		$this->params = array_merge($this->params, array(
			'playlistId' => $playlist_id,
			'part' => 'snippet,contentDetails'
		));

		$playlist = $this->get($this->service_url, $this->params)
						 ->json();
		$this->_fetch_items($playlist);
		$this->_reset_params();
		
		return $playlist;
	}


	function get_channel_playlists($channel_id)
	{
		$this->service_url = 'https://www.googleapis.com/youtube/v3/playlists';
		$this->params = array_merge($this->params, array(
			'channelId' => $channel_id
		);
		
		$playlists = $this->get($this->service_url, $this->params)
						  ->json();
		$this->_fetch_items($playlists);
		$this->_reset_params();

		return $playlists;
	}


	private function _fetch_items(&$object)
	{
		while($object['pageInfo']['totalResults'] > count($object['items']))
		{
			$this->params['pageToken'] = $object['nextPageToken'];
			$object_part = $this->get($this->service_url, $this->params)
							 ->json();

			if(isset($object_part['nextPageToken']))
			{
				$object['nextPageToken'] = $object_part['nextPageToken'];
			}

			$object['items'] = array_merge($object['items'], $object_part['items']);
		}
	}
	private function _reset_params()
	{
		$this->params = array(
			'key' => 'AIzaSyD2g6U5OzaLLvzEBBacZBhfaBIKeoZnKFM', // API Key
			'maxResults' => 50, // Max items in result set
			'part' => 'snippet' // https://developers.google.com/youtube/v3/getting-started#part
		);
	}
}