The Zend Framework blog has posted a preview of Expressive v3, the next major release of their lightweight framework based on its larger sibling, Zend Framework.

Last week, the PSR-15 working group voted to start its review phase. PSR-15 seeks to standardize server-side request handlers and middleware, and both Stratigility and Expressive have been implementing draft specifications since their version 2 releases. Entering the review phase is an important moment: it means that the working group feels the specification is stable and ready for adoption. If, after the review period is over, no major changes are required, the specification can be presented to the PHP-FIG core committed for a final acceptance vote, at which point it will be frozen and ready for mass adoption.

Our plan is to have Stratigility and Expressive follow the new specification in its final form. To that end, we have been executing on a plan to prepare all our projects that work with PSR-15 to adopt the latest round of changes.

That work is ready today!

The post starts by talking about what changes come along with the PSR-15 specification including changes in namespacing, interfaces being renamed and a package split. It then talks about what changes they've made based on the PSR-15 updates and how you can test your own project to ensure it will be compatible with the updates. This includes changes that will be required to upgrade as the PSR-15 changes are not backwards compatible.