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Ahoy StackOverflow,
I have come across this issue in my project: in short, from what I've gathered, is that the PHP script called via AJAX is not properly registering SESSION variables that were set at the top of the index.php page. At first, I assumed that it was due to session locking, so I went ahead and added session_write_close(), however, that didn't fix the issue.
This issue only occurs about 25% percent of the time after a new user session begins (ie: when a user logs in).
I went ahead and deleted 90% of the code to get the bug down to its bare minimum coding necessary to reproduce.
Bad result from Firebug via ajax.php
Expected result from Firebug via ajax.php
Note: Both results show the return of index's print_r($_SESSION) as Array ( [userid] => 3724 [trialstatus] => 1 [trialtcompletions] => 0 [userlevel] => 5 ) which lets me know the issue isn't with the session being set on the index page.
Does anyone know a fix (perhaps not even code-wise, maybe even a server setting) that will properly allow the script called via AJAX to access the Session variable correctly?
Testing Scenario for Reproduction
index.php
<?php
if (session_status() === PHP_SESSION_NONE) session_start();
if (!isset($_SESSION['userid']))
{
$_SESSION['userid'] = 3724; //$login['AccountID'];
}
$_SESSION['trialstatus'] = "12";
$_SESSION['trialtcompletions'] = "12";
$_SESSION['userlevel'] = "12";
session_write_close();
print_r($_SESSION);
?>
<!DOCTYPE html><html><head><script src="./js/jquery.min.js"></script>
<script>
function loadStage(step,input,callback){
$.ajax({
type: "POST",
url: "./ajax.php",
data: { step: step, input: input },
dataType: "JSON",
timeout: 5000,
success: function(data){
if(data !== false){
callback(data);
}
}
});
}
$(document).ready(function(){
startLoadingSequence();
});
function startLoadingSequence(skipped){
loadStage(1,skipped,function(data){});
}
</script>
</head></html>
ajax.php
<?php
if (session_status() === PHP_SESSION_NONE) session_start();
print_r($_SESSION);
if (!isset($_SESSION['userid']))
{
die(json_encode(array(
"error",
"You must be logged in to view report data."
)));
}
?>
Per request:
Read comments for extra information
706
Two things can cause this issue.
115
If you're running a load balancer then you have to make sure your servers are hitting a common point for data. By default PHP stores sessions in the local file system. That becomes a problem if your load balancer sends you from server A to server B, where that file doesn't exist. You could set up a network share and make sure all web servers use that share. So you could create an NFS share and then add session_save_path or set it within php.ini
session_save_path('/your/nfs/share/here');
Another option is to write your own session handler that puts sessions into your database. You could then use something like memcached to store the sessions in a way that you won't hammer your DB every time you read your session data.
8
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