Function: Set the activation hook for a plugin.

Function: Calls the callback functions that have been added to an action hook, specifying arguments in an array.

Function: Checks if any action has been registered for a hook.

Function: Removes a callback function from an action hook.

Function: Removes all of the callback functions from an action hook.

Function: Fires functions attached to a deprecated filter hook.

Function: Fires functions attached to a deprecated action hook.

Function: Gets the basename of a plugin.

Function: Adds a callback function to an action hook.

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