Introducing Filter Event

Let’s start with registering a callback from your Starter Plugin to the post title, i.e. the_title event. You will learn more about namespaces and the full qualified name of your callback.

In this video you will learn and see the following:

• Actions and filters are both stored in one lookup table, i.e. $wp_filter.
• The lookup table is a large, multi-dimensional array.
• The priority is the main key for each event and they are sorted.
• You can set the priority of when you want your event to fire. However, you can’t set the granular sub-priority level within the priority. For example, you can’t set when you want your callback to fire before all the other priority 10 callbacks.