Im trying to sort any array with array_multisort and everything is working great. However, based on conditions in my script, I need to change the options. So What I have so far is this:

array_multisort(
 $sort1,SORT_ASC,
 $sort2,SORT_ASC,
 $sort3,SORT_ASC, 
 $arraytosort
);

and what I would like to have is something like this:

$dynamicSort = "$sort1,SORT_ASC,$sort2,SORT_ASC,$sort3,SORT_ASC,";

array_multisort(
 $dynamicSort, 
 $arraytosort
);

Any suggestions?