[php] How to use store and use session variables across pages?

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.

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;
       }
    }
    ?>

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/

Sessions Step By Step

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!  :) ';
     }
    ?>
   

NOTE: Comments don't have output.

Try this

First Page

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

Second page

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

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;
   }
}

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;

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 

?>