<"&#"
* $postfix 编码后的后缀，默认";"
*/
function unicode_encode($str, $encoding = 'utf-8', $prefix = '&#', $postfix = ';') {
 //将字符串拆分
 $str = iconv("UTF-8", "gb2312", $str);
 $cind = 0;
 $arr_cont = array();
 for ($i = 0; $i < strlen($str); $i++) {
 if (strlen(substr($str, $cind, 1)) > 0) {
  if (ord(substr($str, $cind, 1)) < 0xA1) { //如果为英文则取1个字节
  array_push($arr_cont, substr($str, $cind, 1));
  $cind++;
  } else {
  array_push($arr_cont, substr($str, $cind, 2));
  $cind+=2;
  }
 }
 }
 foreach ($arr_cont as &$row) {
 $row = iconv("gb2312", "UTF-8", $row);
 }
 //转换Unicode码
 foreach ($arr_cont as $key => $value) {
 $unicodestr.= $prefix . base_convert(bin2hex(iconv('utf-8', 'UCS-4', $value)), 16, 10) .$postfix;
 }
 return $unicodestr;
}
/**
* $str Unicode编码后的字符串
* $decoding 原始字符串的编码，默认utf-8
* $prefix 编码字符串的前缀，默认"&#"
* $postfix 编码字符串的后缀，默认";"
*/
function unicode_decode($unistr, $encoding = 'utf-8', $prefix = '&#', $postfix = ';') {
 $arruni = explode($prefix, $unistr);
 $unistr = '';
 for ($i = 1, $len = count($arruni); $i < $len; $i++) {
 if (strlen($postfix) > 0) {
  $arruni[$i] = substr($arruni[$i], 0, strlen($arruni[$i]) - strlen($postfix));
 }
 $temp = intval($arruni[$i]);
 $unistr .= ($temp < 256) "PHP编程：www.jb51.net";
$unistr = unicode_encode($str);
$unistr2 = unicode_decode($unistr);
echo $unistr . '<br />';
echo $unistr2 . '<br />';
$unistr = unicode_encode($str,'GBK','\\u');
$unistr2 = unicode_decode($unistr,'GBK','\\u');
echo $unistr . '<br />';
echo $unistr2 . '<br />';

function unicode_encode($name) {//Unicode编码
 $jsonarr = array($name);
 $jsonstr = json_encode($jsonarr);
 if (empty ($jsonstr))
 return '';
 return substr($jsonstr,2,-2);
}
function unicode_decode($name) {//Unicode解码

 $json = '{"str":"' . $name . '"}';
 $arr = json_decode($json, true);
 if (empty ($arr))
 return '';
 return $arr['str'];

}

$test = "\u811a\u672c\u4e4b\u5bb6";
echo "unicode解码：".unicode_decode($test)."<br/>";
echo "unicode编码：".unicode_encode('')."<br/>";