Phan\Language\Element\Clazz::getReferenceCount PHP Method

    public function getReferenceCount(CodeBase $code_base) : int
    {
        $count = parent::getReferenceCount($code_base);
        // A function that maps a list of elements to the
        // total reference count for all elements
        $list_count = function (array $list) use($code_base) {
            return array_reduce($list, function (int $count, AddressableElement $element) use($code_base) {
                return $count + $element->getReferenceCount($code_base);
            }, 0);
        };
        // Sum up counts for all dependent elements
        $count += $list_count($this->getPropertyList($code_base));
        $count += $list_count($this->getMethodMap($code_base));
        $count += $list_count($this->getConstantMap($code_base));
        return $count;
    }