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function unicode_urldecode($url)
{
preg_match_all("/%u([[:alnum:]]{4})/", $url, $a);
foreach ($a[1] as $uniord)
{
$dec = hexdec($uniord);
$utf = "";
if ($dec < 128)
{
$utf = chr($dec);
}
else if ($dec < 2048)
{
$utf = chr(192 + (($dec - ($dec % 64)) / 64));
$utf .= chr(128 + ($dec % 64));
}
else
{
$utf = chr(224 + (($dec - ($dec % 4096)) / 4096));
$utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64));
$utf .= chr(128 + ($dec % 64));
}
$url = str_replace("%u".$uniord, $utf, $url);
}
return urldecode($url);
}

再就是编码格式的转换,这主要涉及数据的存储和客户端返回,用iconv就搞定,这个函数似乎是从C++中借鉴来的

本文来源:http://www.gdgbn.com/kuzhan/24292/