How to get this php code into a plugin?

[Gladius2007]

Pretty simple question, but I can't figure it out... the original code is

PHP Code:

  <?php require_once('/home/path/file.php'); ?>
       <?php output_NewestThreads(10,"36"); ?>

I'm using it on a regular php page to display latest threads (properly, not how most hacks do it). I can't seem to get it to work in a plugin though, so that I could use it on the board pages too... I've tried several variants that I could think of, but nothing works (getting blank pages). Can anyone point me in the right direction? Thanks.