static public function getCommon($name = null, $default=null)
    {
        $value = self::get($name, self::$range);
        return $value === null ? $default : $value;
    }
static public function getCommon($name = null, $default=null)
    {
        $value = self::get($name, self::$range);
        return $value === null ? $default : $value;
    }
static public function getCommon ( $ name = null , $ default = null ) { $ value = self :: get ( $ name , self :: $ range ) ; return $ value === null ? $ default : $ value ; }
get only common range
@param  string $name
@param  mixed  $default
@return mixed
get only common range