为什么递归不起作用? 郁闷了


Array
(
    [0] => Array
        (
            [0] => 1
            [catid] => 1
            [1] => 0
            [parentid] => 0
            [2] => 关于我们
            [catname] => 关于我们
            [3] => 4
            [listorder] => 4
            [4] => 0
            [items] => 0
            [5] => 1
            [type] => 1
            [child] => Array
                (
                    [0] => Array
                        (
                            [0] => 2
                            [catid] => 2
                            [1] => 1
                            [parentid] => 1
                            [2] => 关于我们
                            [catname] => 关于我们
                            [3] => 1
                            [listorder] => 1
                            [4] => 0
                            [items] => 0
                            [5] => 1
                            [type] => 1
                        )                    [1] => Array
                        (
                            [0] => 3
                            [catid] => 3
                            [1] => 1
                            [parentid] => 1
                            [2] => 公司荣誉
                            [catname] => 公司荣誉
                            [3] => 2
                            [listorder] => 2
                            [4] => 0
                            [items] => 0
                            [5] => 1
                            [type] => 1
                        )                    [2] => Array
                        (
                            [0] => 4
                            [catid] => 4
                            [1] => 1
                            [parentid] => 1
                            [2] => 联系我们
                            [catname] => 联系我们
                            [3] => 3
                            [listorder] => 3
                            [4] => 0
                            [items] => 0
                            [5] => 1
                            [type] => 1
                        )                    [3] => Array
                        (
                            [0] => 5
                            [catid] => 5
                            [1] => 1
                            [parentid] => 1
                            [2] => 加入我们
                            [catname] => 加入我们
                            [3] => 4
                            [listorder] => 4
                            [4] => 0
                            [items] => 0
                            [5] => 1
                            [type] => 1
                        )                    [4] => Array
                        (
                            [0] => 6
                            [catid] => 6
                            [1] => 1
                            [parentid] => 1
                            [2] => 友情链接
                            [catname] => 友情链接
                            [3] => 5
                            [listorder] => 5
                            [4] => 0
                            [items] => 0
                            [5] => 2
                            [type] => 2
                        )                )        )
)
function getTree($arr)
{
// $row  = $arr;
foreach($arr as $k=>$v)
{
    $tree .= '<li><span><a href="content.php?catid='.$v['catid'].'" target="right">'.$v['catname']."</a></span>";                if(is_array($v['child'])){                    $tree .= '<ul>';
                        //遍历child子数组
                        foreach($v['child'] as $sv){
                            $tree .= '<li><span><a href="content.php?catid='.$sv['catid'].'" target="right">'.$sv['catname']."</a></span>";
    //                      getTree($v['child']);                            if(is_array($sv['child'])) {
                                $tree .= '<ul>';
                                foreach($sv['child'] as $ssv){
                                    $tree .= '<li><a href="content.php?catid='.$ssv['catid'].'" target="right">'.$ssv['catname']."</a></li>";
                                }
                                $tree .= "</ul>";
                            }
                            $tree .= "</li>";
                        }
//                        print_r($v['child']);
//                        getTree($v['child']);
                    $tree .= "</ul>";
                }            $tree .= '</li>';
}
return $tree;
}
递归遍历php