Detecting super globals

gistfile1.aw

...
    private $_superGlobals = array(
        '$GLOBALS',
        '$_SERVER',
        '$_GET',
        ...
    );

    public function apply(PHP_PMD_AbstractNode $node)
    {
        foreach ($node->findChildrenOfType('ASTVariable') as $variable) {
            if (in_array($variable->getImage(), $variable->getImage())) {
                $this->addViolation($goto, array($node->getType(), $node->getImage()));
            }
        }
    }
...