Callback functions for Filters will accept a variable, modify it, and return it. Callback functions for an Action do not return anything back to the calling Action hook.įilters give you the ability to change data during the execution of WordPress Core, plugins, and themes. Callback functions for Actions can perform some kind of a task, like echoing output to the user or inserting something into the database. Actions will run at a specific point in the execution of WordPress Core, plugins, and themes. To use either, you need to write a custom function known as a Callback, and then register it with a WordPress hook for a specific action or filter.Īctions allow you to add data or change how WordPress operates. There are two types of hooks: Actions and Filters. They make up the foundation for how plugins and themes interact with WordPress Core, but they’re also used extensively by Core itself. Hooks are a way for one piece of code to interact/modify another piece of code at specific, pre-defined spots.
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