... I send out a list of most interesting libraries and apps in the "PHP" section to about 1100 subscribers.
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The Symfony PHP framework
CakePHP: The Rapid Development Framework for PHP - Official Repository
Biny is a tiny, high-performance PHP framework for web applications
High performance, full-stack PHP framework delivered as a C extension.
Yii 2: The Fast, Secure and Professional PHP Framework
A PHP framework for web artisans
Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs.
Flat-files and plain-old PHP functions rockin'on as a set of general purpose high-level abstractions.