Devise\Templates\TemplatesCleaner::keySearch PHP Method

    private function keySearch(&$keys, $data)
    {
        foreach ($data as $key => $value) {
            if (is_object($value) || is_array($value)) {
                $this->keySearch($keys, $value);
            } else {
                if ($key === "key") {
                    $keys[] = $value;
                }
            }
        }
    }