//字符串转Unicode编码
function unicode_encode($strLong) {
 $strArr = preg_split('/("你"
   }
   $bin_str = preg_replace('/^.{4}(.{4}).{2}(.{6}).{2}(.{6})$/', '$1$2$3', $bin_str);//正则截取, $bin_str应类似0100111101100000,如果是汉字"你"
   $unicode = dechex(bindec($bin_str));//返回unicode十六进制
   $_sup = '';
   for ($i = 0; $i < 4 - strlen($unicode); $i++)
   {
     $_sup .= '0';//补位高字节 0
   }
   $str = '\\u' . $_sup . $unicode; //加上 \u 返回
   $resUnicode .= $str;
 }
 return $resUnicode;
}
//Unicode编码转字符串方法1
function unicode_decode($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 $name;
}
//Unicode编码转字符串
function unicode_decode2($str){
 $json = '{"str":"' . $str . '"}';
 $arr = json_decode($json, true);
 if (empty($arr)) return '';
 return $arr['str'];
}

echo unicode_encode('若水小站:qq963087326'),'<br>';
//结果\u82e5\u6c34\u5c0f\u7ad9\u003a\u0071\u0071\u0039\u0036\u0033\u0030\u0038\u0037\u0033\u0032\u0036

echo unicode_decode('\u82e5\u6c34\u5c0f\u7ad9\u003a\u0071\u0071\u0039\u0036\u0033\u0030\u0038\u0037\u0033\u0032\u0036');
//结果若水小站:qq963087326