如何使用php将对象插入多个类别并检索

我有一个表，其根类别如下：

fruit
vehicle
goods

fruit   => sweet
        => sour
        => mixed

vehicle => car
        => light vehicle
        => hatch back
        => sedan

goods   => furniture
        => wooden
        => home accessories

和子类别，如：

fruit
vehicle
goods

fruit   => sweet
        => sour
        => mixed

vehicle => car
        => light vehicle
        => hatch back
        => sedan

goods   => furniture
        => wooden
        => home accessories

我想使用根类别的多个子类别将对象插入数据库

mango  => fruit(root)   => sour, mixed
maruti => vehicle(root) => car, light vehicle, hatch back
table  => goods(root)   => furniture, wooden, home accessories

在我的html中，我有一个根类别的多个复选框列表，那么如何将其插入数据库并在php中检索它呢？ 我的数据库结构是

parentid  cat_id title
0             1   fruit
0             2    vehicle
0             3    goods
1             4    sour
1             5    sweet
1             6    mixed
2             7    sedan
2             8     hatchback
2             9     car

---

等等

您的数据库中已经有相关的表了吗？您是否从表中找到挑选名单？给我们看看你的代码！：）在我的数据库中，结构类似于父Id，cat Id标题0 1水果0 2车辆0 3货物我已经编写了上述数据库结构，如果我错了，请指导我，如何实现我所需的目标@Tim Ogilvy