How to convert php string to unicode

//字符串转Unicode编码
function unicode_encode($strLong) {
 $strArr = preg_split(&#39;/(?<!^)(?!$)/u&#39;, $strLong);//拆分字符串为数组(含中文字符)
 $resUnicode = &#39;&#39;;
 foreach ($strArr as $str)
 {
   $bin_str = &#39;&#39;;
   $arr = is_array($str) ? $str : str_split($str);//获取字符内部数组表示,此时$arr应类似array(228, 189, 160)
   foreach ($arr as $value)
   {
     $bin_str .= decbin(ord($value));//转成数字再转成二进制字符串,$bin_str应类似111001001011110110100000,如果是汉字"你"
   }
   $bin_str = preg_replace(&#39;/^.{4}(.{4}).{2}(.{6}).{2}(.{6})$/&#39;, &#39;$1$2$3&#39;, $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
   $_sup = &#39;&#39;;
   for ($i = 0; $i < 4 - strlen($unicode); $i++)
   {
     $_sup .= &#39;0&#39;;//补位高字节 0
   }
   $str = &#39;\\u&#39; . $_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
 $pattern = &#39;/([\w]+)|(\\\u([\w]{4}))/i&#39;;
 preg_match_all($pattern, $name, $matches);
 if (!empty($matches))
 {
  $name = &#39;&#39;;
  for ($j = 0; $j < count($matches[0]); $j++)
  {
   $str = $matches[0][$j];
   if (strpos($str, &#39;\\u&#39;) === 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(&#39;UCS-2&#39;, &#39;UTF-8&#39;, $c);
    $name .= $c;
   }
   else
   {
    $name .= $str;
   }
  }
 }
 return $name;
}
//Unicode编码转字符串
function unicode_decode2($str){
 $json = &#39;{"str":"&#39; . $str . &#39;"}&#39;;
 $arr = json_decode($json, true);
 if (empty($arr)) return &#39;&#39;;
 return $arr[&#39;str&#39;];
}

echo unicode_encode(&#39;若水小站:qq963087326&#39;),&#39;<br>&#39;;


echo unicode_decode(&#39;\u82e5\u6c34\u5c0f\u7ad9\u003a\u0071\u0071\u0039\u0036\u0033\u0030\u0038\u0037\u0033\u0032\u0036&#39;);