Session is not being stored - php

Question

Would anyone please show me how to solve this problem? I spent many days looking for the solution, but I couldn't find one.
Here's my problem.
"login.php" file:
require_once("./include/membersite_config.php");
if(isset ($_POST['submitted']))
{
if($fgmembersite->Login())
{
$fgmembersite->RedirectToURL("login-home.php");
}
}
**membersite_config . php ** contains host, username, pass, and also calls **fg_membersite . php ** which contains functions:
function Login()
{
if(empty($_POST['username']))
{
$this->HandleError("UserName is empty!");
return false;
}
if(empty($_POST['password']))
{
$this->HandleError("Password is empty!");
return false;
}
$username = trim($_POST['username']);
$password = trim($_POST['password']);
if(!isset($_SESSION))
{
$sessid = session_start();
}
if(!$this->CheckLoginInDB($username, $password))
{
return false;
}
$_SESSION[$this->GetLoginSessionVar()] = $username;
** echo empty($_SESSION[$sessionvar])? 'true' : 'false'; **
return true;
}
function CheckLogin()
{
if(!isset($_SESSION))
{
session_start();
}
$sessionvar = $this->GetLoginSessionVar();
** echo empty($_SESSION[$sessionvar])? 'true' : 'false'; **
if(empty($_SESSION[$sessionvar]))
{
return false;
}
return true;
}
function GetLoginSessionVar()
{
$retvar = $this->rand_key;
$retvar = 'usr_' . substr($retvar, 0);
return $retvar;
}
function CheckLoginInDB($username, $password)
{
if(!$this->DBLogin())
{
$this->HandleError("Database login failed!");
return false;
}
$username = $this->SanitizeForSQL($username);
$pwdmd5 = $password;
$qry = "Select name, email from $this->tablename where username='$username' and password='$pwdmd5' and confirmcode='y'";
$result = mysql_query($qry, $this->connection);
if(!$result || mysql_num_rows($result) <= 0)
{
$this->HandleError("Error logging in. The username or password does not match");
return false;
}
$row = mysql_fetch_assoc($result);
$_SESSION['name_of_user'] = $row['name'];
$_SESSION['email_of_user'] = $row['email'];
return true;
}
**login - home . php ** after successfully logged in:
require_once("./include/membersite_config.php");
if(!$fgmembersite->CheckLogin())
{
$fgmembersite->RedirectToURL("login.php");
exit;
}
Th problem is: I already echoed to check the status of the $_SESSION[] array. After I input the correct username and password, the echo empty($_SESSION[$sessionvar]) ? 'true': 'false'; in Login function shows false, but the one in CheckLogin shows true. I dont know why.

Answer 1

session_start() starts or continues the session by adding cookies or a query parameter to identify the user. You have to place it at the very top of your template (before anything is printed out, even a blank line), even if the user already has a session:
<?php
session_start();
?>