(PECL gearman >= 0.5.0)
GearmanClient::addTaskLow — Add a low priority task to run in parallel
$function_name,$workload,$context = null,$unique_key = nullAdds a low priority background task to be run in parallel with other tasks. Call this method for all the tasks to be run in parallel, then call GearmanClient::runTasks() to perform the work. Tasks with a low priority will be selected from the queue after those of normal or low priority.
function_nameA registered function the worker is to execute
workloadSerialized data to be processed
contextApplication context to associate with a task
unique_keyA unique ID used to identify a particular task
A GearmanTask object or false if the task could not be added.
Example #1 A low priority task along with two normal tasks
A low priority task is included among two other tasks. A single worker is available, so that tasks are run one at a time, with the low priority task run last.
<?php
# create the gearman client
$gmc= new GearmanClient();
# add the default job server
$gmc->addServer();
# set the callback for when the job is complete
$gmc->setCompleteCallback("reverse_complete");
# add tasks, one of which is low priority
$task= $gmc->addTask("reverse", "Hello World!", null, "1");
$task= $gmc->addTaskLow("reverse", "!dlroW olleH", null, "2");
$task= $gmc->addTask("reverse", "Hello World!", null, "3");
if (! $gmc->runTasks())
{
echo "ERROR " . $gmc->error() . "\n";
exit;
}
echo "DONE\n";
function reverse_complete($task)
{
echo "COMPLETE: " . $task->unique() . ", " . $task->data() . "\n";
}
?>The above example will output something similar to:
COMPLETE: 3, !dlroW olleH COMPLETE: 1, !dlroW olleH COMPLETE: 2, Hello World! DONE