PHP数组怎么镶嵌循环

PHP数组如何镶嵌循环？
$dosql->Execute("SELECT * FROM `#@__infoclass` WHERE parentid=5 AND checkinfo=true ORDER BY orderid ASC");
while($row = $dosql->GetArray())
{
?>

">

$dosql->Execute("SELECT * FROM `#@__infoimg` WHERE classid='".$row['id']."' AND flag ='c' AND checkinfo=true ORDER BY orderid DESC LIMIT 0,6");
while($srow = $dosql->GetArray())
{
?>

">

}
?>

如何循环内在写一个循环

}
?>
------解决方案--------------------
再实例化一个数据库类