Hi, help finding duplicates

I have made this script and have managed to get my results into one variable to display: http://obolynx.com/search/search.php?search=obolynx

but can someone tell me how to make sure the same results don't show twice please, preferably using the url.
I can do it at any level, because it's lots of smaller variables put into one variable.

 

if you are using an array to store results, you can use array_unique.