function escape($str)
{
preg_match_all("/[\xc2-\xdf][\x80-\xbf] |[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}|[\x01-\x7f] /e",$str,$r);
//匹配utf-8字符，
$str = $r[0];
$l = count($str);
for($i=0; $i <$l; $i )
{
$value = ord($str[$i][0]);
if($value < 223)
{
$str[$i] = rawurlencode(utf8_decode($str[$i]));
//先将utf8编码转换为ISO-8859-1编码的单字节字符，urlencode单字节字符.
//utf8_decode()的作用相当于iconv("UTF-8","CP1252",$v)。
}
else
{
$str[$i] = "%u".strtoupper(bin2hex(iconv("UTF-8","UCS-2",$str[$i])));
}
}
return join("",$str);
}

/*
* 用处 ：此函数用来逆转javascript的escape函数编码后的字符。
* 参数：javascript编码过的字符串。
*/
function js_unescape($str)
{
        $ret = '';
        $len = strlen($str);

        for ($i = 0; $i < $len; $i++)
        {
                if ($str[$i] == '%' && $str[$i+1] == 'u')
                {
                        $val = hexdec(substr($str, $i+2, 4));

                        if ($val < 0x7f) $ret .= chr($val);
                        else if($val < 0x800) $ret .= chr(0xc0|($val>>6)).chr(0x80|($val&0x3f));
                        else $ret .= chr(0xe0|($val>>12)).chr(0x80|(($val>>6)&0x3f)).chr(0x80|($val&0x3f));

                        $i += 5;
                }
                else if ($str[$i] == '%')
                {
                        $ret .= urldecode(substr($str, $i, 3));
                        $i += 2;
                }
                else $ret .= $str[$i];
        }
        return $ret;
}