Php 根据特定子id获取祖先树视图

我有一个名为tbl_tasks的任务表。这有数据，也有父项id

表的结构是

    t_id, project_id, title ,          parent_id
      1       1         Task1               0
data  2       1         Sub Task1           1
      3       1         Child Sub task1     2      

    project_id,user_id,t_id,createdby

data  1          1       3      3

还有另一个名为tbl_SharedTask的表，该表中有共享任务的数据

表的结构是

    t_id, project_id, title ,          parent_id
      1       1         Task1               0
data  2       1         Sub Task1           1
      3       1         Child Sub task1     2      

    project_id,user_id,t_id,createdby

data  1          1       3      3

当我想为我的共享任务显示祖先树视图时，这将只检测一条记录，而不检测其父记录。也应该是1和2，因为共享的t_id 3有pareint_id 2，2有pareint_id 1

这是我的密码

  $qry="SELECT sh.task_id,tsk.* FROM tbl_sharedtasks sh,tbl_tasks tsk where sh.project_id=1 and sh.user_id=1 and tsk.t_id=sh.task_id";
                        $result=mysql_query($qry);
                        $arrayCategories2 = array();

                        while($row = mysql_fetch_assoc($result)){ 
                        $arrayCategories2[$row['t_id']] = array("parent_id" => $row['parent_id'], "title" =>                       
                        $row['title'],"task_id" => $row['t_id']);   
                        }
                        ?>

                        <?php
                        if(mysql_num_rows($result)!=0)
                        {
                        ?>
                        <?php 

                        createTreeView($arrayCategories2, 0); ?>
                        <?php
                        }?>

这是我的CreateTreeView函数

function createTreeView($array, $currentParent, $currLevel = 0, $prevLevel = -1) 
{
$id=0;
foreach ($array as $categoryId => $category) 
{
    $id++;

    if ($currentParent == $category['parent_id']) 
    {                       
        if ($currLevel > $prevLevel) echo " <ul style='list-style:none; cursor:pointer' id='folder21'> "; 

        if ($currLevel == $prevLevel) echo " </li> ";

        echo "<li > <span class='file'>&nbsp;";?><a onClick="selecttaskval('<?php echo    $category['task_id'];?>','<?php echo $category['title'];?>');"><?php echo $category['title'];?></a> </span>
        <?php
        if ($currLevel > $prevLevel) { $prevLevel = $currLevel; }

        $currLevel++; 

        createTreeView ($array, $categoryId, $currLevel, $prevLevel);

        $currLevel--;               
    }   

 }

 if ($currLevel == $prevLevel) echo " </li>  </ul> ";

 }

只有当我从tbl_任务中选择记录时，这种方法才能正常工作，但当我想从共享表中检测记录时，这种方法就不行了。

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请帮忙，谢谢

某种类型的“树”处理对此有用吗？可能有用：。也：。如果有测试数据，它也会很有用。什么样的树…？这是ul基本任务树。任务有父任务，我想根据特定子任务id选择所有祖先任务