Checks if any callbacks have been registered for this hook.
WP_Hook::has_filter
Checks if a specific action has been registered for this hook.
WP_Hook::remove_filter
Unhooks a function or method from a specific filter action.
WP_Hook::resort_active_iterations
Handles resetting callback priority keys mid-iteration.
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WP_Hook::add_filter
Hooks a function or method to a specific filter action.
WP_Hook
Core class used to implement action and filter hook functionality.
