interface AbstractMapper
{
    public function objectToArray(ActiveRecordBase $object);
}

和课程：

class ActiveRecordBase
{
   ...
}

class Product extends ActiveRecordBase
{
   ...
}

========

但我不能这样做：

interface ExactMapper implements AbstractMapper
{
    public function objectToArray(Product $object);
}

或这个：

interface ExactMapper extends AbstractMapper
{
    public function objectToArray(Product $object);
}

我有错误“声明必须兼容”

那么,有没有办法在PHP中执行此操作？