Method: Normalizes filters set up before WordPress has initialized to WP_Hook objects.
Method: Checks if any callbacks have been registered for this hook.
Method: Removes all callbacks from the current filter.
Method: Calls the callback functions that have been added to a filter hook.
Method: Calls the callback functions that have been added to an action hook.
Method: Processes the functions hooked into the ‘all’ hook.
Method: Return the current priority level of the currently running iteration of the hook.
Class: Core class used to implement action and filter hook functionality.
Method: Adds a callback function to a filter hook.
Method: Handles resetting callback priority keys mid-iteration.
Method: Removes a callback function from a filter hook.
Method: Checks if a specific callback has been registered for this hook.