title: I want to list video from a list of channel
body: <p>With youtube API, i would like to list video not only for one channel but from a list of channel, 
  with listSearch command it would be something like that ? but it's dont work ...</p>
  
  <pre><code>$searchResponse = $youtube-&gt;search-&gt;listSearch('id,snippet', array(
    'maxResults' =&gt; _MAX_,
    'type' =&gt; "video",
    'order' =&gt; 'date',
    "channelId" =&gt; "id_channel_1,id_channel_2, ..."
  ));
  </code></pre>