In this recent post to their site, Easybib shares a presentation and the answers to some questions about extending Composer, the popular package management tool for PHP.
Composer is one of the core tooling we use at EasyBib when we work on the various products for the company. [This] deck of slides is from a talk I gave at the Berlin PHP Usergroup meetup in November. [...] In addition, there were a few questions how dependencies are handle in a project when installed through composer’s global command.
They answer questions about loading global vendors (and what should/shouldn't be installed this way) as well as which one wins - the globally installed version or local.