转载自http://subin.org.cn/blog/post/464

[code]<?php
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：YOKA\u738b （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>http -> '.unicode_decode('\u0068\u0074\u0074\u0070').'</h3>';

$name = 'subin';

echo '<h3>'.unicode_encode($name).'</h3>';
?>[/code]