(PECL gearman >= 0.6.0)
GearmanClient::addOptions — Add client options
$options
   )Adds one or more options to those already set.
options
       The options to add.
       One of the following constants, or a combination of
       them using the bitwise OR operator ("|"):
       GEARMAN_CLIENT_GENERATE_UNIQUE,
       GEARMAN_CLIENT_NON_BLOCKING,
       GEARMAN_CLIENT_UNBUFFERED_RESULT or
       GEARMAN_CLIENT_FREE_TASKS.
      
   Always returns TRUE.