php汉字unicode编码与解码

<?php
//将内容进行unicode编码，编码后的内容格式：yokau738b （原始：yoka王）
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;
} // （脚本学堂 www.jb200.com 编辑整理）

// 将unicode编码后的内容进行解码，编码后的内容格式：yokau738b （原始：yoka王）
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;
}

echo '<h3>yokau738b -> '.unicode_decode('yokau738b').'</h3>';
$name = 'yoka王';
echo '<h3>'.unicode_encode($name).'</h3>';