I know SS has the ability to import csv files and show results. In my case I want to compare two csv files and show the records that match. I assume this would need two upload fields and converting the csv data to arrays which need to be compared. If this is the best way, can someone give an example how to do that on silverstripe?
SilverStripe also has a Diff library bundled (framework/core/Diff.php) which is used for showing diffs between page versions (DataDifferencer), haven't used it too much so I personally can't help much but take a look to see if those classes can help.