public function getFile($key)
    {
        $key = str_replace($this->illegalChars, '_', $this->namespace . $key);
        return $this->dir . '/' . $key . '.' . $this->ext;
    }
public function getFile($key)
    {
        $key = str_replace($this->illegalChars, '_', $this->namespace . $key);
        return $this->dir . '/' . $key . '.' . $this->ext;
    }
public function getFile ( $ key ) { $ key = str_replace ( $ this -> illegalChars , '_' , $ this -> namespace . $ key ) ; return $ this -> dir . '/' . $ key . '.' . $ this -> ext ; }
Get cache file by key

@param  string $key
@return string
Get cache file by key