How to use store and use session variables across pages?

问题

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

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

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

<?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.

回答1:

Reasoning from the comments to this question, it appears a lack of an adjusted session.save_path causes 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.

回答2:

Sessions Step By Step

Defining session before everything, No output should be before that, NO OUTPUT
```
<?php
session_start();
?>
```

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@example.com';
?>

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!  :) ';
  }
 ?>

NOTE: Comments don't have output.

回答3:

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

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

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

?>

回答4:

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:

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

And

<?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5:

Try this

First Page

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

Second page

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

回答6:

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

Here is the fix that worked for me.

File1.php

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

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

File2.php

session_id('mySessionID'); 
session_start();

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

回答7:

Starting a Session:

Put below code at the top of file.

<?php session_start();?>

Storing a session variable:

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

To Check if data stored in session variable:

<?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/

回答8:

Try this:

<!-- 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;
       }
    }
    ?>

来源：https://stackoverflow.com/questions/5489365/how-to-use-store-and-use-session-variables-across-pages

标签

php

session

session-variables