PHPのCookieの文字化け問題を解決する方法

<?php
setcookie ("TestCookie", urlencode("这就是网页21"));
?>

<script type="text/javascript">
    alert(decodeURI(getCookie("TestCookie")))
    function getCookie(sName) {
    var aCookie = document.cookie.split(&#39;; &#39;);
    for (var i=0; i < aCookie.length; i++) {
    var aCrumb = aCookie[i].split(&#39;=&#39;);
    if (sName == aCrumb[0])
    return decodeURI(aCrumb[1]);
 }
 return &#39;&#39;;
}
</script>

<script type="text/javascript">function setCookie(name, value, time){
    var nameString = name + &#39;=&#39; + encodeURI(value);
    var expiryString = "";
    if(time !== 0) {
        var expdate = new Date();
        if(time == null || isNaN(time)) time = 60*60*1000;
        expdate.setTime(expdate.getTime() +  time);
     expiryString = &#39; ;expires = &#39;+ expdate.toGMTString();
 }
 var path = " ;path =/";
 document.cookie = nameString + expiryString + path;
}setCookie("TestJsCookie", "我是中国人", 0)  </script>

<?php
echo urldecode($_COOKIE["TestJsCookie"]);
?>