protected function processKey($key)
    {
        $key = trim(strtolower($key));
        $key = preg_replace('#[^a-z0-9\.]#', '-', $key) . '~' . $this->keySuffix;

        return $key;
    }
protected function processKey($key)
    {
        $key = trim(strtolower($key));
        $key = preg_replace('#[^a-z0-9\.]#', '-', $key) . '~' . $this->keySuffix;

        return $key;
    }
protected function processKey ( $ key ) { $ key = trim ( strtolower ( $ key ) ) ; $ key = preg_replace ( '#[^a-z0-9\.]#' , '-' , $ key ) . '~' . $ this -> keySuffix ; return $ key ; }
Process the key to be filename safe

@param string $key
@return string
Process the key to be filename safe