读取session中数组有关问题

$query ="select * from #@__arctype where isbaike=1";
        $this->dsql->Execute("bkarry",$query);
		$bkarry=array();
		session_start();
		if(!session_is_registered("bkarry")){

			while($row2 = $this->dsql->GetArray("bkarry"))
        	{
				$bkarry[]=$row2;
			}
			$bkarry2=serialize($bkarry);
			$_SESSION['bkarry']=$bkarry2;


		}else{

			$bkarry=unserialize($_SESSION['bkarry']);
		}
		//unset($_SESSION['bkarry']);   
		//var_dump($bkarry);

    while($row = $bkarry)
        {	var_dump($row);

        }
		exit();

while($row = $bkarry) {
  var_dump($row);
}

session_start();
$query ="select * from #@__arctype where isbaike=1";
if(! isset($_SESSION['bkarry'])) {
  $this->dsql->Execute("bkarry",$query);
  while($row2 = $this->dsql->GetArray("bkarry"))
  {
    $_SESSION['bkarry'][] = $row2;
  }
}
$bkarry =& $_SESSION['bkarry'];