Question

在访问另一个网页中的会话变量时遇到一些问题

我尝试使用jquery刷新创建会话的页面（data.php），数据库连接和sql查询也可以正常工作，并对其进行了独立测试。

test.php

    <?php
    session_start();
    ?>

    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title></title>

    </head>
    <body>
         <div id="show">   </div>

         <script type="text/javascript" src="jquery.js"></script>
         <script type="text/javascript">
                $(document).ready(function() {
                setInterval(function () {
                $('#show').load('data.php')  // reloades data.php repetedly
                }, 1000);
        });
        </script>

        <?php   echo $_SESSION["id"];  ?>
    </body>
    </html>

data.php

<?php    
session_start();


$conn = new mysqli("localhost","id6207501_datausername","123456789","id6207501_dataname");
    if ($conn->connect_error) {
    die("Connection error: " . $conn->connect_error);
    }
$result = $conn->query("SELECT status,id FROM logs order by id desc limit 1");
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
    $_SESSION["id"]=$row['id'];
    $_SESSION["status"]=$row['status'];

     }
}

?>

我希望test.php打印会话变量$_SESSION["id"]的值，但不会。

Answer 1

您必须调用AJAX get方法并设置将文本返回到data.php文件中。

test.php

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <title></title>

<head>

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script type="text/javascript">
    setInterval(function () {

            $.get("data.php", function(data, status){
                $('#show').html(data);
            });
            }, 1000);
    </script>

 </head>
 <body>
    <div id="show"> <?php   echo $_SESSION["id"];  ?>  </div>
 </body>
 </html>

data.php

<?php    
session_start();

// You can uncomment it and test

// $conn = new mysqli("localhost","id6207501_datausername","123456789","id6207501_dataname");
//     if ($conn->connect_error) {
//     die("Connection error: " . $conn->connect_error);
//     }
// $result = $conn->query("SELECT status,id FROM logs order by id desc limit 1");
// if ($result->num_rows > 0) {
// while ($row = $result->fetch_assoc()) {
//     echo $_SESSION["id"]=$row['id'];
//     echo $_SESSION["status"]=$row['status'];

//      }
// }

    // Comment when you uncomment DB
    // FOR example purpose 
    $_SESSION["id"]= rand(1,2000);

    echo $_SESSION["id"];

?>

Answer 2

您还可以使用本地存储。在第一页中设置变量值。

<script>localstroage.setItem("myItem","value");</script>

然后使用getItem在另一页中获取值

<script>var x = localstroage.getItem("myItem");</script>

或者自大

<script type="text/javascript">document.cookie = "cookieName=cookieValue";</script>

在php页面中

  <?php $phpVar =  $_COOKIE['cookieName'];echo $phpVar ;?>

Answer 3

首先，检查会话是否在任何页面上正常工作

将此行添加到顶部

<?php

ini_set('session.save_path',realpath(dirname($_SERVER['DOCUMENT_ROOT']) . '/../session'));
session_start();

这既适用于使用header('Location: ')从PHP重定向，又适用于JavaScript window.location。

如何在另一个网页中访问一个PHP变量

3 个答案: