Description:
------------
libgearman version => 1.1.12
(libgearman version => 1.1.8 - all working fine)
I try to "$worker->addFunction()" after "$worker->unregisterAll()" and new function does not registered.


Test script:
---------------
$worker->addServer('localhost', '4730');
//add test fucntion
$worker->addFunction('test', 'test_function');
//unregister all
$worker->unregisterAll();
//try to add function
$worker->addFunction('test', 'test_function'); //- as result function no added

Expected result:
----------------
New function will added

Actual result:
--------------
New function will not added