I have several sets of the same type [Y, M, D] and am trying to write a function to search these sets and return an array of the available sets that fit my parameters.

ReturnedSets = return_matches(Y,M,D);

I want the three parameters of the function return_matches to be optional. Which means any combination of values can be used to return the sets.

For example, one could write - return_matches(13,null,2); - and the function would look for all sets that contain [13, anyValue, 2];

I'm writing this in PHP, to allow users to manage dated files on my website, but I'd like to be able to use this function again for other uses.

Thanks!

edit: (This, or variations of this, is all I can come up with so far... There is something extra that I don't understand, because this function ends up / would not work to return sets that contain y and d, but leaving m arbitrary.

if(y == s[0]){

        if(m == s[1]){

            if(d == s[2]){

                print "day match";

                }

            } else {print "month match";}

        } else {print "year match";}

    } else {print "no match";}