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copied!<p>There are multiple issues to consider. As you noted a plugin system depends on registering extensions with the application, and the extension itselfs need a way to hook into the main application.</p> <p>For all its faults, Wordpress has a quite workable approach to this. It <a href="https://stackoverflow.com/questions/5127424/how-does-plugin-system-work-wordpress-mybb/5127470#5127470">uses "hooks"</a> for interfacing to plugins. That's basically a callback-system which more or less can amount to "event-driven" too. Fundamentally the main application does something like:</p> <pre><code>foreach ($callback["need_to_render_sidebar"] as $fn) { $fn(); } </code></pre> <p>But you can make it more flexible with passing extra parameters, returning data, and more importantly: using objects rather than procedural callbacks for more complex features. (I'd avise to mix and match. There's not one approach that suits <em>all</em> applications or extensions.)</p> <p>Likewise a plugin system often enables the extensions itself to call back the main application, feed data into it, or modify settings.</p> <p>The second part you need to consider for a plugin system is how you make it manageable. There basically each WebCMS/DMS has its own approach. Many use zip files to be manually extracted, or module directories. For starters a WP-like approach of meta-data augmented script files is the most suitable. I made a similar system which can be used independently of WP, though it's pretty rough: <a href="http://milki.include-once.org/genericplugins/" rel="nofollow noreferrer">http://milki.include-once.org/genericplugins/</a> (the nice part is actually the manageability of settings.)</p>

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