Part III: Developing WordPress Plugins in Java

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Part III: Developing WordPress Plugins
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you ll have to try for yourself, or check out any of the hacked plugins out there. Other than doing database stuff, there really aren t all that many issues with WordPress MU. You may want to check out the WordPress MU functions to further open the doors to MU plugin development: codex.wordpress.org/WPMU_Functions. Another thing to consider when creating plugins for WordPress MU is how they are intended to be used. Naturally this always applies, but since you can run WordPress MU in so many ways, open or closed, with plugins enabled for bloggers, just for admin, and so on, you may have to rethink the way the plugin works. All in all, don t be daunted by WordPress MU when it comes to plugin development. It is basically the same, and will most likely actually be the same in the future. A merge is in the works, according to the WordPress developers, so the issues you re experiencing with MU plugins right now may actually work themselves out on their own.
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Site-wide WordPress MU Plugins
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Plugins placed in wp-content/mu-plugins/ are called site-wide plugins, and they are always activated per default. To uninstall or even make them inactive you need to remove them, which makes them a bit special. After all, not being able to turn off a feature may change the way things work. As of WordPress MU 2.8, the option to activate plugins site-wide from within admin was added. This means that you can activate plugins located in wp-content/plugins/ to be active site-wide, just like the mu-plugins. This is of course a lot more user-friendly, so you should definitely consider managing site-wide plugin-powered features this way, rather than with mu-plugins. After all, since WordPress MU supports automatic updates, just like regular WordPress, the more that are available at a click from within the admin interface, the better. So that s it, you re writing a plugin. Now you can share it with the world by releasing it in the official WordPress directory.
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Good Practice for Releasing Plugins
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Just like with themes, there is an official plugin directory on wordpress.org where you can host your plugins. You don t have to, of course, but it is through this that the users can get the automatic update to work, and keeping them up-to-date with your latest fixes is usually a good idea. However, there are some terms that your plugins needs to fulfill to be hosted on wordpress. org:
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The plugins needs to be licensed under a GPL-compatible license. The plugin can t do anything illegal, nor be morally offensive. The plugin needs to be hosted in the wordpress.org subversion repository. The plugin needs a valid readme file.
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7: Anatomy of a WordPress Plugin
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To get access, you need to be a wordpress.org user. Then, submit your plugin (wordpress.org/ extend/plugins/add/) and wait for approval. This process can take some time, depending on workload of the people involved. When approved, you ll get access to the subversion directory, to which you submit a zip archive containing the plugin, along with a valid readme file. Yes, valid; there is a readme validator that makes sure that all the data needed for the wordpress.org directory to list the plugin information is there: wordpress.org/extend/plugins/about/validator/. You should read the Developer FAQ for the Plugin Directory before submitting a plugin to make sure you have the most up-to-date information on the matter. This will almost certainly speed up the approval process. You ll find it here: wordpress.org/extend/plugins/about/faq/. The benefits of being hosted in the wordpress.org repository are not only the automatic update functionality from within the actual users admin interfaces, but also the statistics it adds. You ll see how many people have downloaded the plugin, get ratings, and you can get comments on it. Not only that, wordpress.org is also the central point for WordPress, which means chances are people will find your plugin, as opposed to just hosting it on your own site and hoping people come across it. Add the new in-admin plugin search interface, and your plugin can be found from within any up-to-date WordPress system out there, and installed at a few clicks at that. That is, if you re in the wordpress.org repository. So get in there! 165
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