PHP 7 Nested Anonymous Classes Tutorial - PHP Classes

Inheritance for Static Class Constructor in PHP, by Thi Tran, TinySo

[PHP] Inheritance and abstract classes - Doc4Dev

PHP Keywords List of Various PHP Keywords You Need To Know

Can I use extends inside `template_from_string` · Issue #1134 · twigphp/Twig · GitHub

You can dynamically create and extend interfaces in PHP

Override Core Module - Error

Please Help Me: How To Join A Table From Other Database In Cgirdview? - Web Application Development With Yii And PHP - Yii Framework Forum

Fixed - extension_hint.php is not updated when importing via xf-dev:import

Extend Catalog Rule Conditions

The Complete PHP 7 Guide for Web Developers