PHP UTF-8和Unicode编号互转

PHP UTF-8和Unicode编号互转

/**
     * 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;
    }