(PECL gearman >= 0.5.0) Run a high priority task in the background

(PECL gearman >= 0.5.0) Set a callback for collecting task status

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

(PECL gearman >= 0.5.0) Get the last Gearman return code

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

(PECL gearman <= 0.5.0) Get the application data (deprecated)