Gearman caused by PHP Fatal error____php

Gearman extension installed, wrote a test code test_gearman.php

<?php
$worker = new Gearmanworker ();
$worker->addserver ();
$worker->addfunction ("reverse", "my_reverse_function");
while ($worker->work ());

function My_reverse_function ($job)
{return
  strrev ($job->workload ());
>

$ PHP test_gearman.php

PHP Fatal error:uncaught exception ' gearmanexception ' with message ' Failed to set exception option ' IN/USERS/WORLDZHY/D Ocuments/inceptionpad/test_gearman.php:3

Stack Trace:

#0/users/worldzhy/documents/inceptionpad/test_gearman.php (3): Gearmanworker->addserver ()

#1 {main}

Thrown in/users/worldzhy/documents/inceptionpad/test_gearman.php on line 3

This error occurs because the Gearman server is not started, and the gearmand-d is executed.

$/usr/local/cellar/gearman/1.1.12/sbin/gearmand-d