(PECL gearman >= 0.5.0) Clear all task callback functions

(PECL gearman >= 0.5.0) Set a function to be called on task completion

(PECL gearman >= 0.6.0) Set application context

(PECL gearman >= 0.6.0) Add client options

(PECL gearman >= 0.5.0) Get the status for the running task

(PECL gearman >= 0.5.0) Get an errno value

(PECL gearman >= 0.5.0) Returns an error string for the last error encountered.

(PECL gearman >= 0.5.0) Run a single high priority task

(PECL gearman >= 0.5.0) Add a low priority background task to be run in parallel

(PECL gearman >= 0.5.0) Create a copy of a