未定义数组索引: child

        <div class="lc-l-n">
          <?php if(is_array($allCat) || $allCat instanceof \think\Collection || $allCat instanceof \think\Paginator): $i = 0; $__LIST__ = $allCat;if( count($__LIST__)==0 ) : echo "" ;else: foreach($__LIST__ as $key=>$vo): $mod = ($i % 2 );++$i;?>
          <ul>
            <h1 class="lc-l-n-A">
              <a href="/index/goods/list?cid=<?php echo htmlentities($vo['id']); ?>">
                <span><?php echo htmlentities($vo['cat_name']); ?></span>
                <img src="/static/index/img/xia3.png" alt="">
              </a>
            </h1>
            <?php if(is_array($vo['child']) || $vo['child'] instanceof \think\Collection || $vo['child'] instanceof \think\Paginator): $i = 0; $__LIST__ = $vo['child'];if( count($__LIST__)==0 ) : echo "" ;else: foreach($__LIST__ as $key=>$er): $mod = ($i % 2 );++$i;?>
            <li>
              <h2 class="lc-l-n-h2">
                <span>|</span>
                <a href="/index/goods/list?cid=<?php echo htmlentities($er['id']); ?>"><?php echo htmlentities($er['cat_name']); ?></a>
              </h2>
              <div>
                <!-- <a class="lc-l-n-d" href="#">--TOC配件耗材</a> -->
                <?php if(!(empty($er['child']) || (($er['child'] instanceof \think\Collection || $er['child'] instanceof \think\Paginator ) && $er['child']->isEmpty()))): if(is_array($er['child']) || $er['child'] instanceof \think\Collection || $er['child'] instanceof \think\Paginator): $i = 0; $__LIST__ = $er['child'];if( count($__LIST__)==0 ) : echo "" ;else: foreach($__LIST__ as $key=>$san): $mod = ($i % 2 );++$i;?>
                <a href="javascript:;" data-href="/index/goods/list?cid=<?php echo htmlentities($san['id']); ?>" class="mya"><?php echo htmlentities($san['cat_name']); if(!(empty($san['child']) || (($san['child'] instanceof \think\Collection || $san['child'] instanceof \think\Paginator ) && $san['child']->isEmpty()))): ?>