Undefined variable: _SESSION when sending variables via post through JavaScript trigger

Question

In my index.php file I call session_start() and set a couple of session variables. In a second PHP file I would like to access these session variables.

Thing is, this PHP file is purely a backend script and is POSTed to when a JavaScript function is triggered. When the POST call attempts to cause the script in the second PHP file to be executed the error log is reporting that:

_SESSION is an undefined variable.

I've tried calling start_session() and session_regenerate_id() at the top of the second PHP file but the issue has persisted.

I'm assuming what is going on is that because it's in a POST this PHP file is in its own session as I am still able to do this $_COOKIE[ini_get('session.name')].

The information that I am trying to pass to the second PHP file isn't anything that needs to be secured but it would be nice to know in the future how to do this: call a PHP file via a POST and still have my session variables.

Answer 1

There's nothing special whatsoever about POST requests and sessions.
You just need to call session_start at the top of every file request you want to use sessions in, that's it.

Try again with that in mind, it ought to work.

Answer 2

session_start();  

is the answer of most of topic like this. i have been struggling with this issue and i solve my problem with this code

    if (version_compare(PHP_VERSION, '5.4.0', '<')) {
        if(session_id() == '') {session_start();}
    } else  {
       if (session_status() == PHP_SESSION_NONE) {session_start();}
    }

Answer 3

you must include

<?php session_start();?>

at the beginning of your document, this will start the SESSION ENGINE and enable you to set session variables (ie. $_SESSION['var1'], $_SESSION['var2'], etc)

If you're wanting to get values from a $_POST you could relate the two together by :

$_SESSION['var1'] = $_POST['answer1']

Answer 4

I came faced with this problem, and after trying a lot of things, I just included session_start() on the second script and it worked.

Answer 5

Add the following code to the file browse.php:

error_reporting( error_reporting() & ~E_NOTICE );
if( ! ini_get('date.timezone') )
{
    date_default_timezone_set('GMT');
}
if (version_compare(PHP_VERSION, '5.4.0', '<')) {
    if(session_id() == '') {session_start();}
} else  {
   if (session_status() == PHP_SESSION_NONE) {session_start();}
}   

It will work fine.