ประกาศค่าตัวแปรไว้ดังนี้
$sql = "SELECT status from tbjobunit WHERE unitid = '".$rowuser["workunit"]."'";
    $resultunit = $db_conn->query ($sql);
    $rowunit = mysql_fetch_array($resultunit);
   
    session_register('myauth');
    $myauth['userid'] =  $row["userid"];
    $myauth['userin'] =  $row["empid"];
    $myauth['empid'] =  $row["empid"];
    $myauth['ugroup'] = $row["ugroup"];
    $myauth['ueditjob'] = $row["ueditjob"];
    $myauth['prank'] =  $rowuser["emprank"];
    $myauth['pname'] = $rowuser["empname"];
    $myauth['psname'] = $rowuser["empsname"];
    $myauth['empflag'] = $rowuser["empflag"];
    $myauth['pposition'] = $rowuser["workposition"];
    $myauth['pworkunit'] = $rowuser["workunit"];
    $myauth['workplace'] = $rowuser["workplace"];
    $myauth['unitstatus'] = $rowunit["status"];
    header("Location: main.php");
    exit();
}
เมื่อโยนค่าไปอีกหน้า แสดง Error ว่าไม่รู้จักค่า  myauth
PHP Notice: Undefined variable: myauth in D:\Inetpub\wwwroot\myphp\eOfficeCode\main.php on line 5

แสดงข้อมูลอีกหน้า
session_start();
echo $myauth['empid'];

เป็นเพราะอะไร