Add a low priority task to run in parallel

GearmanClient::addTaskHighBackground
GearmanClient::addTaskLowBackground
GearmanClient
PHP Manual

# GearmanClient::addTaskLow

(PECL gearman >= 0.5.0)

GearmanClient::addTaskLow — Add a low priority task to run in parallel

### Description

public GearmanTask GearmanClient::addTaskLow ( string `$function_name` , string `$workload` [, mixed `&$context` [, string `$unique` ]] )

Adds 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.

### Parameters

`function_name`

  A registered function the worker is to execute

`workload`

  Serialized data to be processed

`context`

  Application context to associate with a task

`unique`

  A unique ID used to identify a particular task

### Return Values

A GearmanTask object or `FALSE` if the task could not be added.

### Examples

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

### See Also

- GearmanClient::addTask - Add a task to be run in parallel
- GearmanClient::addTaskHigh - Add a high priority task to run in parallel
- GearmanClient::addTaskBackground - Add a background task to be run in parallel
- GearmanClient::addTaskHighBackground - Add a high priority background task to be run in parallel
- GearmanClient::addTaskLowBackground - Add a low priority background task to be run in parallel
- GearmanClient::runTasks - Run a list of tasks in parallel

GearmanClient::addTaskHighBackground
GearmanClient::addTaskLowBackground
GearmanClient
PHP Manual