How data in action is shared

How data in action is shared
In the code, within a controller, containing multiple actions, I want to set the relevant variable in one action for another action read, how to do it.

Class Indexcontroller extends Zend_controller_action {
Public Function indexaction () {
if (zend_registry::isregistered (' Adminloginerror ')) {
$adminLoginError = Zend_registry::get (' Adminloginerror ');
} else {
$adminLoginError = $username. "Welcome to visit my website";
}
}
Public Function testaction () {
Zend_registry::set (' Adminloginerror ', ' abc ');
$this->_redirect ('/index ');
}
}
The above code, in use can not be obtained, ask the high people to help me to answer the next. Thank you.

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