@since: 4.7.0

Determines whether an offset value exists.

Retrieves a value at a specified offset.

Sets a value at a specified offset.

Unsets a specified offset.

Returns the current element.

Moves forward to the next element.

Returns the key of the current element.

Checks if current position is valid.

Rewinds the Iterator to the first element.

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

Hooks a function or method to a specific filter action.

Handles resetting callback priority keys mid-iteration.

Unhooks a function or method from a specific filter action.

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

Checks if any callbacks have been registered for this hook.