//    print_r($allDelId);return;
    if (in_array($parent_id, $allDelId)) {
        // 父栏目在回收站中 还原失败 应该先还原父栏目
        echo "2";
        return;
    }
    $arr = array('is_delete' => 0);
    $res = $mu->update($arr, 'cate_id=' . $cate_id);
    if ($res != 1) {
        // 还原失败
        echo '1';
        return;
    } else {
        // 还原成功
        echo '0';
        return;
    }
} else {
    if ($type = 'drop') {
        $res = $mu->delete('cate_id=' . $cate_id);
        if ($res != 1) {
            // 彻底删除失败
            echo '1';
            return;
        } else {
            // 彻底删除成功
            echo '0';
            return;
        }
    }
}
<?php

require_once 'head.php';
require_once 'conexao.php';
require_once 'ModelUser.php';
$usuario = new ModelUser($conexao);
if (isset($_GET['excluido'])) {
    $usuario->setNome($_GET['excluido']);
    $usuario->delete();
    echo '<h2>Os dados do aluno ' . $_GET['excluido'] . ' foram excluidos!</h2>';
}
// 获得要操作的goods_id
if (!isset($_POST['goods_id']) || intval($_POST['goods_id']) < 1) {
    echo "1";
    return;
}
$goods_id = intval($_POST['goods_id']);
// 还原被删除的商品
if ($type == 'return') {
    $res = $mu->update(array('is_delete' => 0), 'goods_id=' . $goods_id);
    if ($res != 1) {
        echo "1";
        return;
    } else {
        echo "0";
        return;
    }
} else {
    if ($type = 'fulldel') {
        $res = $mu->delete('goods_id=' . $goods_id);
        if ($res != 1) {
            echo "1";
            return;
        } else {
            echo "0";
            return;
        }
    } else {
        echo "1";
        return;
    }
}