code: public function channelList(array $filter = array())
      {
          if ($this->channelList === null) {
              $channels = $this->request("channellist -topic -flags -voice -limits -icon")->toAssocArray("cid");
  
              $this->channelList = array();
  
              foreach ($channels as $cid => $channel) {
                  $this->channelList[$cid] = new Channel($this, $channel);
              }
  
              $this->resetNodeList();
          }
  
          return $this->filterList($this->channelList, $filter);
      }
docs: Returns an array filled with Channel objects.
  
  @param  array $filter
  @return array