Laravel is the number 1 PHP framework, and includes an oauth system called 'Socialite' There are a huge number of socialte providers at http://socialiteproviders.github.io/ It would be great to see sample code / projects using Laravel and Socialite to connect to SharePoint online.

I would love to see an example where SPO can be used as a 'document store' for projects in Laravel. Other ideas include the standard list storage/retrieval/query mechanism for list items, calendar events. etc...

On a related note. Flarum.org is a forum built on Laravel, still in it's infancy, but all the rage in the PHP community right now, I could see an extension allowing users to post links to content in onedrive, or for corporations using it internally to have a message board that takes attachments and automagically stores them in a document library in SPO.