Yii2 Gearman - is it possible to use static functions?

Question

Yii

Is it possible somehow inside yii2 to use the definition of static functions for

<?php
$worker= new GearmanWorker();
$worker->addServer();
$worker->addFunction("reverse", "my_reverse_function");
while ($worker->work());

function my_reverse_function($job)
{
  return strrev($job->workload());
}
?>