PHPSMARTY双循环(递归)输出分类有关问题

PHPSMARTY双循环(递归)输出分类有关问题

PHP SMARTY 双循环(递归)输出分类 问题
模版

PHP code

{foreach from=$classlist item=newsclass}
    {$newsclass.classname}
{/foreach}

程序

PHP code

$sql = "select * from jh_newsclass where parentid = 0";
$result = $mysqli->query($sql);
while ($row = $result->fetch_row()) {
    $classlist[] = array(
        'id'=>$row[0],
        'classname'=>$row[2],
        'parentid'=>$row[1],
        'ispro'=>$row[3],    
        );
}
$result->close();
$mysqli->close();
$smarty->assign('classlist',$classlist);
$smarty->assign('webname',Webname);
$smarty->display('admin/left.htm');

这样只能输出一级分类. 我需要在一级分类下再输出二级..三级..该怎么写呀? 


以前用ASP输出的效果

HTML code

              新闻专题
+--新闻动态
+--美大专题
+--月兔专题

    供求信息

              产品展示
+--美大灶具
+--月图厨柜
+--集成效果

原来的ASP代码 

HTML code

<%
dim strs
Set Rs = server.CreateObject(JH_RS)
sql = "select * from jh_newsclass where parentid = 0"
Rs.Open SQL,Conn,1,1
while not rs.eof
%>
<%
        set strs = conn.execute("select * from jh_newsclass where parentid = " & rs("id"))
        if strs.eof and strs.bof then
%>

    &newsclass=<%=rs("id")%><%if rs("ispro") then response.Write("&ispro=true")%>" target="main"><%=rs("classname")%>
<%
        else
%>
              <%=rs("classname")%>
<%
        end if
%>
        <%call showparentclass("+","--",rs("id"))%>
<%
rs.movenext
wend
rs.close
set rs = nothing
%>
<%
sub showparentclass(astr,tree,parentid)
    dim showparentclassrs,temprs
    set showparentclassrs = conn.execute("select * from Jh_newsclass where parentid = " & parentid)
    if showparentclassrs.eof then 
        exit sub
    else
    response.Write("
")
        while not showparentclassrs.eof

            response.Write"
"
            set temprs = conn.execute("select * from Jh_newsclass where parentid = " & showparentclassrs("id"))
            if temprs.eof and temprs.bof then
                response.Write"" & astr & tree & "" & showparentclassrs("classname")&""
            else
                response.Write astr & tree & "" & showparentclassrs("classname")
            end if
            set temprs = nothing
            response.Write"
"


            call showparentclass(astr,tree&"--",showparentclassrs("id"))
        showparentclassrs.movenext
        wend
    response.Write("
")
    end if
end sub
%>

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