(PECL gearman <= 0.5.0) Send data for a task (deprecated)
(PECL gearman >= 0.5.0) Get data returned for a task
(PECL gearman >= 0.5.0) Create a GearmanTask instance
(PECL gearman >= 0.5.0) Determine if task is known
(PECL gearman >= 0.5.0) Test whether the task is currently running
(PECL gearman >= 0.5.0) Get completion percentage numerator
(PECL gearman >= 0.5.0) Read work or result data into a buffer for a task
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