Session variables don't get passed to the third page after session start - session-variables

Question

after starting a new session in my login.php i rediredct to home.php and load session variables successfully.But when i try to open menu.php from home.php and use session variables , those same variables are unndefined now. I echoed the session id after both page changes and its exactly the same. So can anyone please tell me why am i losing these variables?
login.php:
session_start();
$_SESSION["user"]=$puser;
$_SESSION["loggedin"]=true;
echo "<script>window.open('../home.php','_self')</script>";
?>
home.php
require("php/objects.php");
session_start();
if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"]==true)
{
$user=$_SESSION["user"];
$_SESSION["loggedin"]=true;
echo session_id();
echo $_SESSION["loggedin"];
}
else
{
echo "Login Error";
echo "<script>window.open('default.html','_self')</script>";
exit();
}``
?>
menu.php
require("objects.php");
session_start();
echo session_id();
echo $_SESSION["loggedin"];
/*if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"]==true)
{
$user=$_SESSION["user"];
$utype=isset($user->salary)?"staff":"client";
}
else
{
echo "Login Error";
echo "<script>window.open('../default.html','_self')</script>";
exit();
}*/``
?>
when i click a link in home.php with href=menu.php i get an error that index loggedin is undefined

Answer 1

I don't know what is in your objects.php, calling session should probably come before that.
session_start();
require("objects.php");
echo session_id();
echo $_SESSION["loggedin"];