public function destroy($sessionId)
    {
        $this->_memcache->delete(Kwf_Cache_Simple::getUniquePrefix().'sess-'.$sessionId);
        $this->_memcache->delete(Kwf_Cache_Simple::getUniquePrefix().'sess-db-'.$sessionId);
        Kwf_Registry::get('db')->query("DELETE FROM kwf_sessions WHERE sessionId=?", $sessionId); 
        return true;
    }
public function destroy($sessionId)
    {
        $this->_memcache->delete(Kwf_Cache_Simple::getUniquePrefix().'sess-'.$sessionId);
        $this->_memcache->delete(Kwf_Cache_Simple::getUniquePrefix().'sess-db-'.$sessionId);
        Kwf_Registry::get('db')->query("DELETE FROM kwf_sessions WHERE sessionId=?", $sessionId); 
        return true;
    }
public function destroy ( $ sessionId ) { $ this -> _memcache -> delete ( Kwf_Cache_Simple :: getUniquePrefix ( ) . 'sess-' . $ sessionId ) ; $ this -> _memcache -> delete ( Kwf_Cache_Simple :: getUniquePrefix ( ) . 'sess-db-' . $ sessionId ) ; Kwf_Registry :: get ( 'db' ) -> query ( "DELETE FROM kwf_sessions WHERE sessionId=?" , $ sessionId ) ; return true ; }
destroy of the session

@param string $sessionId
@return bool
destroy of the session