As I've got solution I post it to community.
According to http://www.php.net/manual/en/keyword.parent.php it's
impossible to access parent variables using parent::
The only way to access parent variable is _not_ to use same variable
name in derived class.
So I put a new variable into my custom Controller and wrote constructor
to merge helper definition arrays.
app_controller.php:
<?php
class AppController extends Controller {
var $helpers = array('html','javascript');
}
?>
controllers/investors_controller.php:
<?php
class InvestorsController extends AppController {
var $extendHelpers = array('Child', 'Contact');
function __construct(){
parent::__construct();
$this->helpers = array_merge($this->helpers,
$this->extendHelpers);
}
}
?>
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