PHP中对汉字进展UNICODE编码和解码的功能

<?php//将内容进行UNICODE编码，编码后的内容格式：\u56fe\u7247 （原始：图片）function unicode_encode($name){    $name = iconv('UTF-8', 'UCS-2', $name);    $len = strlen($name);    $str = '';    for ($i = 0; $i < $len - 1; $i = $i + 2)    {        $c = $name[$i];        $c2 = $name[$i + 1];        if (ord($c) > 0)        {    // 两个字节的文字            $str .= '\u'.base_convert(ord($c), 10, 16).base_convert(ord($c2), 10, 16);        }        else        {            $str .= $c2;        }    }    return $str;}// 将UNICODE编码后的内容进行解码，编码后的内容格式：\u56fe\u7247 （原始：图片）function unicode_decode($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 = 0; $j < count($matches[0]); $j++)        {            $str = $matches[0][$j];            if (strpos($str, '\\u') === 0)            {                $code = base_convert(substr($str, 2, 2), 16, 10);                $code2 = base_convert(substr($str, 4), 16, 10);                $c = chr($code).chr($code2);                $c = iconv('UCS-2', 'UTF-8', $c);                $name .= $c;            }            else            {                $name .= $str;            }        }    }    return $name;}//测试用例：//编码$name = '图片';echo '<h3>'.unicode_encode($name).'</h3>';//解码echo '<h3>'.unicode_decode('\u56fe\u7247').'</h3>';