PHP解密Unicode及Escape加密字符串

function unicode2utf8($c) {
$str="";
if ($c < 0x80) {
$str.=chr($c);
} else if ($c < 0x800) {
$str.=chr(0xc0 | $c>>6);
$str.=chr(0x80 | $c & 0x3f);
} else if ($c < 0x10000) {
$str.=chr(0xe0 | $c>>12);
$str.=chr(0x80 | $c>>6 & 0x3f);
$str.=chr(0x80 | $c & 0x3f);
} else if ($c < 0x200000) {
$str.=chr(0xf0 | $c>>18);
$str.=chr(0x80 | $c>>12 & 0x3f);
$str.=chr(0x80 | $c>>6 & 0x3f);
$str.=chr(0x80 | $c & 0x3f);
}
return $str;
}

$str='%u5927%u5BB6%u597D%uFF0C我是孤魂！
u8FD9u662Fu6D4Bu8BD5u6587u672CuFF01';
echo uni_decode($str); // 大家好，我是孤魂！这是测试文本！

$v){ if(ord($ar[$k])>=127){ $tmpString=bin2hex(iconv("GBK","ucs-2",$v)); if (!eregi("WIN",PHP_OS)){ $tmpString = substr($tmpString,2,2).substr($tmpString,2); } $reString.="%u".$tmpString; } else { $reString.= rawurlencode($v); } } return $reString; }