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WordPress features a built‐in plugin editor on the Plugins ➪ Plugin Editor screen. The plugin editor enables you to view and edit the source code of any plugin installed in WordPress. Keep in mind you can edit the source code only if the plugin file is writable by the web server; otherwise, you can only view the code.

To use the editor, select the plugin from the drop‐down menu on the top‐right portion of the Edit Plugins page. The editor lists all files associated with the selected plugin. There is also a documentation lookup feature that makes it easy to research a specific function's purpose in the plugin you are reviewing.

WARNING A word of caution when using the built‐in plugin editor: a browser doesn't have an Undo button. There is also no code revision history, so one bad code edit can crash your entire website with no way to revert the changes. It's best to use the code editor for reference only and never use it to edit your plugin files.