Core class used to implement action and filter hook functionality.

Adds a callback function to a filter hook.

Calls the callback functions that have been added to a filter hook.

Normalizes filters set up before WordPress has initialized to WP_Hook objects.

Description Pending

Return the current priority level of the currently running iteration of the hook.

Calls the callback functions that have been added to an action hook.

Processes the functions hooked into the ‘all’ hook.

Checks if a specific callback has been registered for this hook.

Checks if any callbacks have been registered for this hook.