public function lists($key, $default = null)
	{
		$results = array();
		foreach ($this->_data as $data)
		{
			array_push($results, $data->get($key));
		}
		return $results;
	}
public function lists($key, $default = null)
	{
		$results = array();
		foreach ($this->_data as $data)
		{
			array_push($results, $data->get($key));
		}
		return $results;
	}
public function lists ( $ key , $ default = null ) { $ results = array ( ) ; foreach ( $ this -> _data as $ data ) { array_push ( $ results , $ data -> get ( $ key ) ) ; } return $ results ; }
Lists a specific key from the item list

@param   string  $key      Key to grab from item
@param   string  $default  Default value if key is empty
@return  array   Array of keys
Lists a specific key from the item list