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

(PECL gearman >= 0.5.0) Get the job handle

(PECL gearman >= 0.5.0) Get completion percentage denominator

(PECL gearman >= 0.5.0) Get the size of returned data

(PECL gearman >= 0.6.0) Send the result and complete status

(PECL gearman >= 0.6.0) Unregister all function names with the job servers

(PECL gearman >= 0.5.0) Wait for and perform jobs

(PECL gearman >= 0.5.0) Get the job handle

(PECL gearman >= 0.5.0) Set client options

(PECL gearman <= 0.5.0) Callback function when there is a data packet for a task (deprecated)