it is very easy; use
sort after the for loop
you have to tell us on what kind of data you are trying to operate, it helps us to tell you what kind of sort you have to use
what $data[0] and $data[1] contain?
Vivek
-- In accordance with the prarabdha of each, the One whose function it is to ordain makes each to act. What will not happen will never happen, whatever effort one may put forth. And what will happen will not fail to happen, however much one may seek to prevent it. This is certain. The part of wisdom therefore is to stay quiet.