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Most PHP Programming frameworks (and, by extension, PHP CMS systems) have a boundary between “code that makes the system run” and “code third parties can add to the system to build features”. Sometimes this boundary is clear. Other times this boundary blurs beyond recognition. WordPress has a plugin system which is nothing more complex than a single PHP file that WordPress will load before rendering a page. On the other end of the spectrum systems like Magento or Symfony allow you to add folders...