The php[architect] magazine has released their latest edition, their issue for October 2015 - "Integrating Extensions":
This issue shows you how to use Solr search directly from PHP and put it to good use, explains how PHAR files work to bundle PHP applications in a single file, and provides a case study in using libfann from PHP to create and train a neural network.
Also, you can read up on how to prepare for PHP 7, learn PHP type casting peculiarities, migrate from WordPress to Sculpin, a chat with Stefan Koopmanschap, and more.
This month's issue also includes a free article so you can get a sampling of the magazine: Casting Tales in PHP. You can pick up just this issue or grab a year long digital/print/combo subscription directly from the php[architect] website.