PHP生成指定长度的随机汉字

    /**
     * Desc: 生成指定长度的随机汉字
     * @param integer   $length     长度
     * @return string
     */
    public function makeChineseCharacters($length)
    {
        $chinese = '';
        for ($i=0;$i<$length;$i++)
        {
            $chr = chr(mt_rand(0xB0,0xD0)).chr(mt_rand(0xA1, 0xF0));
            $chinese .= iconv('GB2312', 'UTF-8', $chr);
        }
        return $chinese;
    }