Another wild goose chase. PHP 7 does not come with it’s ftp extension enabled by default. Typically you’d uncomment the line “extension=ftp.so” in the php.ini file. However, Heroku doesn’t support php.ini. In their docs, Heroku asks users to add a “.user.ini” file. Which didn’t work for me and some other folks who write blogs. Even explicitly telling the procfile to load the file did not work.
So here’s the latest solution that I would’ve found if I searched the docs more closely instead of going straight to the Google search bar. Just add the following to your composer.json file’s required block.
Be sure to composer update for a new composer.lock file before deploying.