[PHP] ค่า session ไม่มาครับ จาก code ด้านบน มันจะขึ้น You don't have permission to delete this photo! ตลอดเลยครับ

<?
ob_start();
session_start();
require_once("inc/config.php"); 
require_once("lib/cpaint2.inc.php"); 
require_once ("inc/ftp.class.php");

$userid = $_SESSION['member_id'];
$usergid = $_SESSION['grant'];


function u_deleteimage($authid,$chk)

{

    global $cp, $server_dir;  
    

    $filename=explode("|",$chk);    

    unset($filename[0]);

    $fid="";

    foreach ($filename as $fn) {
	

			if($fn!="" && $fn!="on")

    {

            $fid.="|".$fn;

            

            $query = "SELECT * from tb_images where images_name = '$fn'";

            $result = mysql_query($query) or die("Query failed.");

            while ($line = mysql_fetch_array($result)) {

                if ($line[userid]!=$authid) {
				
            $msg="You don't have permission to delete this photo!";
				
				}
				
				else {

........

}