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WP_Hook::has_filters

Checks if any callbacks have been registered for this hook.

WP_Hook::apply_filters

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

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WP_Hook::do_action

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

WP_Hook::current_priority

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

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WP_Hook::next

Moves forward to the next element.

WP_Hook::key

Returns the key of the current element.