/**

     * utf-8 转unicode

     *

     * @param string $name

     * @return string

     */

    function utf8_unicode($name){

        $name = iconv('UTF-8', 'UCS-2', $name);

        $len  = strlen($name);

        $str  = '';

        for ($i = ; $i < $len - ; $i = $i + ){

            $c  = $name[$i];

            $c2 = $name[$i + ];

            if (ord($c) > ){   //两个字节的文字

                $str .= '\u'.base_convert(ord($c), , ).str_pad(base_convert(ord($c2), , ), , , STR_PAD_LEFT);

                //$str .= base_convert(ord($c), 10, 16).str_pad(base_convert(ord($c2), 10, 16), 2, 0, STR_PAD_LEFT);

            } else {

                $str .= '\u'.str_pad(base_convert(ord($c2), , ), , , STR_PAD_LEFT);

                //$str .= str_pad(base_convert(ord($c2), 10, 16), 4, 0, STR_PAD_LEFT);

            }

        }

        $str = strtoupper($str);//转换为大写

        return $str;

    }  

    /**

     * unicode 转 utf-8

     *

     * @param string $name

     * @return string

     */

    function unicode_decode($name)

    {

        $name = strtolower($name);

        // 转换编码，将Unicode编码转换成可以浏览的utf-8编码

        $pattern = '/([\w]+)|(\\\u([\w]{4}))/i';

        preg_match_all($pattern, $name, $matches);

        if (!empty($matches))

        {

            $name = '';

            for ($j = ; $j < count($matches[]); $j++)

            {

                $str = $matches[][$j];

                if (strpos($str, '\\u') === )

                {

                    $code = base_convert(substr($str, , ), , );

                    $code2 = base_convert(substr($str, ), , );

                    $c = chr($code).chr($code2);

                    $c = iconv('UCS-2', 'UTF-8', $c);

                    $name .= $c;

                }

                else

                {

                    $name .= $str;

                }

            }

        }

        return $name;

    }