某些浏览器中cookie的未定义索引

当用户登录时，我使用在专家交流中找到的登录脚本来制作cookie。

登录页面的处理过程如下：

function process_login() {
    var username = $.trim($('#input_username').val());
    var password = $.trim($('#input_password').val());
    username = $.trim(username);
    password = $.trim(password);
    var remember = document.getElementById("remember_user_checkbox").checked;
    if (!username || !password) {
        return false;
    }
    remember == true ? remember = "true" : remember = "false";
    $.ajax({
        type: "POST",
        cache: false,
        url: "login_user.php",
        data: "username=" + username + "&password=" + password + "&remember=" + remember,
        dataType: "json",
        success: function (data) {
            if (data == "FALSE") {
                $('#input_password').val("");
                alert("The username or password you have entered is incorrect.");
                return false;
            }
            window.location = "orders-home.php?<?=time()?>";
        }
    });
}

并提交给login-user.php，此处：

<?php
include('login-config.php');
$username = pg_escape_string($_POST['username']);
$password = pg_escape_string($_POST['password']);
//no encryption for now

//php gets this as a string
$remember = $_POST['remember'];
if ( $remember == "true" )
{
    $remember = TRUE;   
}
else
{
    $remember = FALSE;  
}

$user_query = "SELECT * FROM users WHERE username = '$username' AND password = '$password' LIMIT 1";
$user_result = pg_query( $con , $user_query );
if ( !$user_result )
{
    echo json_encode("FALSE");  
}

$arr = array();
if (!$user_result)
{
die( pg_last_error($con) );
}
else
{ 
       while ( $row = pg_fetch_array($user_result) )
       {
          //put the customer id in a session so we can put it in a cookie later
          //then when the page is refreshed the stored customer id will be used
          //as their ksisoldby identifier
          if ( $row['cust_id'] )
          {
             $_SESSION['customer_id'] = $row['cust_id'];
             $_SESSION['customer_name'] = $row['first_name']." ".$row['last_name'];
             $_SESSION['uid'] = $row['id'];

             if ( $remember )
             {
                remember_user($row["id"]);
             }
          }
         $arr[] = array(
         "first_name"          =>$row['first_name'],
         "last_name"           =>$row['last_name'],
         "customer_id"         =>$row['cust_id'],
         "accepted_terms"      =>$row['accepted_terms'],
         );   
       }
}
if ( empty($arr) ){
echo json_encode('FALSE');
}
else
{
    $path = '/webtrack';
    $site = 'www.isco.net';

    if ($remember === TRUE)
    {
         $remember_time =  time()+60*60*24*30;
         setcookie('username', $username, $remember_time, $path, $site);
         setcookie('customer_id', $_SESSION['customer_id'], $remember_time, $path, $site);
         setcookie('customer_name', $_SESSION['customer_name'], $remember_time, $path, $site);
        // setcookie('uuk', $uuk, $remember_time, $path, $site);
    }
    else
    {
         setcookie('username', $username, false, $path, $site);
         setcookie('customer_id', $_SESSION['customer_id'], false, $path, $site);
         setcookie('customer_name', $_SESSION['customer_name'], false, $path, $site);
    }
echo json_encode($arr);
}
?>

然后我从cookie打印到主屏幕上

<div class="fl customer_id">
    <?= strtoupper($_COOKIE['customer_name']); ?>
</div>

但是我得到错误

Notice: Undefined index: customer_name in /home/iscotest/public_html/webtrack/orders-home.php

实际的网站是www.isco.net。但该网站托管在iscotest.com上。isco.net只是指向iscotest.com。这可能是我的cookie没有设置的原因吗？

这是一个相当大的问题，因为这完全停止了页面的加载，因为cookie信息被用来检索显示的数据

另一件奇怪的事情是，这个错误并没有持续出现。我在一台电脑上看到了safari和chrome的错误，但该网站在safari和chrome的另一台电脑中正常运行。

感谢您的帮助