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(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 .
  
[#1] goran dot v dot miskovic at gmail dot com [2012-09-08 09:12:07]
To add multiple 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);
?>