This is a great Module. I thought I'd start off with that.
I have Search API module installed and I'm able to create Views based off of the Search Indexes I've made.
When I try and add any Global PHP field to one of these Search Index views, the results are blank. the individual fields I enter in the View appear fine, it's just the PHP field that's blank.
When I add something like
<?php print '<pre>'; print_r($row); print '</pre>'; ?>
in the Global PHP field, I get this returned:
The Global PHP fields work great when I create a standard View.