php - double sort troubles

Question

Suppose there are two fields in the user table, one is the number of questions num, and the other is the time. Now we need to sort by num first, and then sort the same num by time.
For example (num has three numbers, 5, 7, 5, and then sorted by nun to get 5, 5, 7, but is there any way to sort the same two 5 and 5 by tine separately)

Answer 1

order by num desc,time desc Isn’t this easy to do?

Answer 2

Database query can be solved by SQL. If it is only implemented in PHP, you can take a look at thisarray_multisort