In this first part of a series, I introduce the key concepts that surround the implementation of the Plug-in design pattern in PHP. I also show you how to use it to build an easily extensible application. The sample program in this case will render a few simple HTML widgets on screen, such as divs and paragraphs, but this functionality can be easily extended to other elements as well.

Read the full article here: The PHP Plug-in Pattern

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