The file `boilerplate.php` is the one you'll probably want to work with. You'll want to point your browser to this file. It contains some initializations where the most important one is the variable `$pairingfile`. You'll want to set this to existing pairing file.
The other variable (`$pairingfileformat`) is a variable that defines the format of the above pairing file. For now only `Pairtwo-6` and `Pairtwo-5` are available. In the future more formats will become available.
Below the comments you'll find some example code. This code is only a aggregation of several fields that are read out. If you need any modifications like putting the rankings in a table or you want to just write it to a file, go ahead it's all yours.
What if I need other dependencies?
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If you started to ask yourself this question, you'll probably know what composer and dependency management is? Therefore this section will become a little more advanced than the ones above.
It's actually very simple, just add them like you normally would do.
$ composer require phpoffice/phpspreadsheet
If you already have a project with other dependencies you'll only want to copy the `boilerplate.php` file and run.