static public function set($key, $value) {
        $config = &self::$_config;
        
        Utils::arraySet($config, $key, $value);
    }
static public function set($key, $value) {
        $config = &self::$_config;
        
        Utils::arraySet($config, $key, $value);
    }
static public function set ( $ key , $ value ) { $ config = & self :: $ _config ; Utils :: arraySet ( $ config , $ key , $ value ) ; }
Add or set configuration key

@access  public
@param   string  $key    Configuration key
@param   string  $value  Configuration value
@return  void
Add or set configuration key