What Are the Differences Between PSR-0 and PSR-4?
They are very similar so it is not surprising that it’s a bit confusing. The summary is that PSR-0 had some backwards compatibility features for PEAR-style classnames that PSR-4 dropped, as such it only supports namespaced code. On top of that PSR-4 does not force you to have the whole namespace as a directory structure, … Read more