protected function getFileName($key)
    {
        $file = $this->getFilePath() . $this->encrypt($key) . $this->fileExtension;

        return $file;
    }
protected function getFileName($key)
    {
        $file = $this->getFilePath() . $this->encrypt($key) . $this->fileExtension;

        return $file;
    }
protected function getFileName ( $ key ) { $ file = $ this -> getFilePath ( ) . $ this -> encrypt ( $ key ) . $ this -> fileExtension ; return $ file ; }
Get cache filename

@param string $key
@return string
Get cache filename