Oh. Turns out it really was as simple as creating a symlink to the ini file where the php executable is located. Hahah!
Steps
- Open up the shell for the site
- Run
which php
- Copy that URL and paste it into PhpStorm for the executable path
- Run
php -i
in the terminal - At the top of the output, grab the ini configuration path
- In a separate terminal (not in the Local shell) cd to the directory where the php file is located
- Run
ln -s /path/to/php.ini php.in
— using the php.ini path from above