It does two different tasks:
- If you don’t pass in your callback name, then it checks if any callbacks are registered to the specified event.
- Else, it checks if the callback (your function, method, or closure) is registered to a specific filter hook event.
- The name of the event (filter hook) you want to check.
- The fully qualified name of your callback.
- If you pass in a callback, then it returns the priority number for your callback if it is registered; else you’ll get a
- Otherwise, it turns
TRUEif there are callbacks are registered; else
Hands off the keyboard. Web development starts by thinking first, then planning it out, and then coding it.
More coming soon…keep checking back.
These are the PHP constructs used in WordPress Core for