To remove several options at once use pipe separated list.<?php$client = new GearmanClient();$client->addOptions(GEARMAN_CLIENT_NON_BLOCKING | GEARMAN_CLIENT_FREE_TASKS | GEARMAN_CLIENT_UNBUFFERED_RESULT);$client->removeOptions(GEARMAN_CLIENT_NON_BLOCKING | GEARMAN_CLIENT_FREE_TASKS);?>