PHPでmssqlのjsonデータを読み込む際に中国語が文字化けする場合の解決策について

<?php 
/**
* 如果员工编号在MySql中不存在则在MySql中插入员工记录
* 如果该员工编号已经存在则进行更新操作
*/
//如果用JSON格式则要使用text/html，不能使用text/xml
header("Content-Type: text/html;charset=utf-8");
// header("Content-Type: text/html;charset=GBK");
//告诉浏览器不要缓存数据
header("Cache-Control: no-cache");
require &#39;../conn.php&#39;;
$seq = $_POST["seq"];
$employeeID = $_POST["employeeID"];
$employeeName = $_POST["employeeName"];
$department = $_POST["department"];
if(!isset($seq) || $seq == ""){//seq不存在则插入新记录
$query = "INSERT INTO employees (employeeID, employeeName, department, 
createTime, updateTime)
VALUES (N&#39;$employeeID&#39;,N&#39;$employeeName&#39;,N&#39;$department&#39;, 
getdate(), getdate())";
}else{//如果seq已存在则更新已有记录
$query = "UPDATE employees SET employeeID=&#39;$employeeID&#39;, 
employeeName=&#39;$employeeName&#39;,department=&#39;$department&#39;,
updateTime=getdate() 
WHERE seq=&#39;$seq&#39;";
}
// file_put_contents("E:/mylog.log", $query."\r\n",FILE_APPEND);//用于调试
<span style="color:#FF0000;">$query = iconv("utf-8", "gbk//ignore", $query);//为了解决中文乱码问题</span>
if($result = sqlsrv_query($conn, $query)){
echo true;
}else{
echo false;
}
// echo $query;
?>