Availability: >= 3.0
Type: Object Method
Description: Registers a new feature.
$editor->registerFeature( string $idname [, array $buttons [, mixed $onenable [, mixed $ondisable]]] );
A unique ID to identify your new feature.
An array of button identifiers for buttons related to this feature.
The name of a function to be called when this feature is enabled.
The name of a function to be called when this feature is disabled
Once a feature is registered it is disabled until you enable it using enableFeature.