MongoId::__set_state Create a dummy MongoId &reftitle.description; publicstaticMongoIdMongoId::__set_state arrayprops This function is only used by PHP internally, it shouldn't need to ever be called by the user. It is identical to the function: ]]> &reftitle.parameters; props Theoretically, an array of properties used to create the new id. However, as MongoId instances have no properties, this is not used. &reftitle.returnvalues; A new id with the value "000000000000000000000000".