php 如何跨页面使用存储和使用会话变量？

How to use store and use session variables across pages?

提问by ab11

When one page is accessed, I would like to start a session and store a session variable:

当访问一个页面时，我想启动一个会话并存储一个会话变量：

<?php
  session_start(); 
  $_SESSION['myvar']='myvalue';
?>

Then from another page, I would like to check if that session variable has been stored:

然后从另一个页面，我想检查该会话变量是否已存储：

<?php
    session_start();
    echo("1");
    if(isset($_SESSION['myvar']))
    {
        echo("2");
       if($_SESSION['myvar'] == 'myvalue')
       {
           echo("3");
           exit;
       }
    }
    ?>

This code does not work for me.

这段代码对我不起作用。

采纳答案by Gumbo

Reasoning from the comments to this question, it appears a lack of an adjusted session.save_pathcauses this misbehavior of PHP's session handler. Just specify a directory (outside your document root directory) that exists and is both readable and writeable by PHP to fix this.

从对这个问题的评论来看，似乎缺少调整后的session.save_path会导致 PHP 会话处理程序的这种不当行为。只需指定一个存在且 PHP 可读可写的目录（在文档根目录之外）即可解决此问题。

回答by Mohammad Kermani

Sessions Step By Step

分步会议

1. Defining session before everything, No output should be before that, NO OUTPUT

   <?php
   session_start();
   ?>
   

2. Set your session inside a page and then you have access in that page. For example this is page 1.php

   <?php
      //This is page 1 and then we will use session that defined from this page:
       session_start();
       $_SESSION['email']='[email protected]';
   ?>
   

3. Using and Getting session in 2.php

    <?php
   
   //In this page I am going to use session:
   
     session_start();
     if($_SESSION['email']){
     echo 'Your Email Is Here!  :) ';
     }
    ?>
   

1. 在一切之前定义会话，在那之前应该没有输出，没有输出

   <?php
   session_start();
   ?>
   

2. 在页面内设置您的会话，然后您就可以访问该页面。例如这是页面 1.php

   <?php
      //This is page 1 and then we will use session that defined from this page:
       session_start();
       $_SESSION['email']='[email protected]';
   ?>
   

3. 在2.php 中使用和获取会话

    <?php
   
   //In this page I am going to use session:
   
     session_start();
     if($_SESSION['email']){
     echo 'Your Email Is Here!  :) ';
     }
    ?>
   

NOTE: Comments don't have output.

注意：评论没有输出。

回答by gaurav

All you want to do is write --- session_start(); ----- on both pages..

您要做的就是编写 --- session_start(); ----- 在两页上..

<!-- first page -->
<?php
  session_start(); 
  $_SESSION['myvar'] = 'hello';
?>

<!-- second page -->
<?php
    session_start();
    echo $_SESSION['myvar']; // it will print hello 

?>

回答by zzzzBov

In the possibility that the second page doesn't have shared access to the session cookie, you'll need to set the session cookie path using session_set_cookie_params:

如果第二页没有对会话 cookie 的共享访问权限，您需要使用session_set_cookie_params设置会话 cookie 路径：

<?php
session_set_cookie_params( $lifetime, '/shared/path/to/files/' );
session_start();
$_SESSION['myvar']='myvalue';

And

和

<?php
session_set_cookie_params( $lifetime, '/shared/path/to/files/' );
session_start();
echo("1");
if(isset($_SESSION['myvar']))
{
    echo("2");
   if($_SESSION['myvar'] == 'myvalue')
   {
       echo("3");
       exit;
   }
}

回答by vivek

Try this

尝试这个

First Page

第一页

<?php
   session_start();
   $_SESSION['myvar']='myvalue';
?>

Second page

第二页

 <?php
   session_start();
   echo $_SESSION['myvar'];
 ?>

回答by Nitin Hurkadli

Every time you start a session (applies to PHP version 5.2.54), session_start()creates a new session id.

每次启动会话（适用于 PHP 5.2.54 版）时，session_start()都会创建一个新的会话 ID。

Here is the fix that worked for me.

这是对我有用的修复程序。

File1.php

文件1.php

session_id('mySessionID'); //SET id first before calling  session start
session_start();

$name = "Nitin Hurkadli";
$_SESSION['username'] = $name;

File2.php

文件2.php

session_id('mySessionID'); 
session_start();

$name = $_SESSION['username'];
echo "Hello  " . $name;

回答by user3796796

Starting a Session:

开始会话：

Put below code at the top of file.

将下面的代码放在文件的顶部。

<?php session_start();?>

Storing a session variable:

存储会话变量：

<?php $_SESSION['id']=10; ?>

To Check if data stored in session variable:

检查数据是否存储在会话变量中：

<?php if(isset($_SESSION['id']) && !empty(isset($_SESSION['id'])))
echo “Session id “.$_SESSION['id'].” exist”;
else
echo “Session not set “;?>

?> detail here http://skillrow.com/sessions-in-php-4/

?> 详情请见http://skillrow.com/sessions-in-php-4/

回答by iamandrus

Try this:

尝试这个：

<!-- first page -->
<?php
  session_start(); 
  session_register('myvar');
  $_SESSION['myvar'] == 'myvalue';
?>

<!-- second page -->
<?php
    session_start();
    echo("1");
    if(session_is_registered('myvar'))
    {
        echo("2");
       if($_SESSION['myvar'] == 'myvalue')
       {
           echo("3");
           exit;
       }
    }
    ?>