How to extend lifetime of legacy PHP applications : r/PHP

PHP Object Oriented Programming : PHP CLASS Extends - ONPHPID

Advanced PHP Simplified

Extending FilamentPHP: A Comprehensive Guide to Building Custom Components and Integrations

PHP class inheritance with extended class

Top PHP Development Companies - DevX

You can dynamically create and extend interfaces in PHP

JFrog Artifactory Extends The Universe with PHP Support for Developers

Benefits of PHP for building Web Apps

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

Extending WordPress Blocks with JavaScript (and PHP) Block Filter Hooks - Tutorial with Video - JavaScript for WordPress