I've seen on a few tutorials that there are numbers at the end of the call to save Custom Fields/Meta Boxes on the
save_post hook. For example, in the WordPress Codex it gives the following example:
<?php add_action( 'save_post', 'my_save_post', 10, 2 ); ?>
What do the 10 and 2 mean at the end?
I've tried talking to an "expert", but they've been of no help ;)