The magic sleep method is called by the PHP runtime environment before an
instance of this class gets serialized. It returns an array with the
names of all those properties that should be cached for this class or
interface instance.
/** * The magic sleep method is called by the PHP runtime environment before an * instance of this class gets serialized. It returns an array with the * names of all those properties that should be cached for this class or * interface instance. * * @return array * @since 0.10.0 */ public function __sleep() { return array_merge(array('constants', 'interfaceReferences', 'parentClassReference'), parent::__sleep()); }