How to sort the resulting array by field?

Question

PHP

Hello!
I ask for help in the following question:
As a result of a query to the MYSQL database, an array of data was obtained, which is safely displayed.
The array has a date field 'date_dec' (date in YYYY-MM-DD format).
But you still need to sort all this by the date field in descending order, and then display it.
Simply sorting by date already in the sql-query itself, I say right away - is not an option. It is necessary to sort the result of the query.
I'm leaning towards the array_multisort() function, but something doesn't work at all, because little experience.
Here is the required part of the code:

/*$_POST['n_dec'];
$_POST['date_dec'];
$_POST['name_dec'];*/

while($row = mysqli_fetch_assoc($query)){ 
  echo $row['n_dec'] ." | ". $row['date_dec'] ." | ". $row['name_dec'];
}

I will be glad for any help. Thank you.