My mistake above was that I was trying to point to the database's directory, when the php file had already handled that for me. Running the program was as simple as running the following code:
php -q /path/to/my/doc.php
I found it was easiest to manage launchtl
through a $5-$10 program called lingon. Highly recommended if you are considering managing multiple crons at a time. Otherwise, if you want to stick to the command line, this is a good tutorial.