Checking if user is admin or normal - php

Question

I am having problems checking whether the user is admin or not in the database. I made it so if admin has the value 1 for the users profile then they are admin and is redirected to the admin page and if not they are redirected to the login page. However I gave my personal account the value of 1 in the database however it is still redirecting me to the login page.
I have given my code below for you to see if I have done anything wrong, please tell me as I have only just started learning PHP.
<?php
session_start();
// First we cubrid_execute(conn_identifier, SQL)te our common code to connection to the database and start the session
require("include/common.php");
$admin = $_POST['admin'];
$user = $_POST['username'];
// At the top of the page we check to see whether the user is logged in or not
if(empty($_SESSION['user']))
{
// If they are not, we redirect them to the login page.
header("Location: login.php");
// Remember that this die statement is absolutely critical. Without it,
// people can view your members-only content without logging in.
die("Redirecting to login.php");
}
// Everything below this point in the file is secured by the login system
// We can retrieve a list of members from the database using a SELECT query.
// In this case we do not have a WHERE clause because we want to select all
// of the rows from the database table.
$query = "
SELECT *
FROM users
";
try
{
// These two statements run the query against your database table.
$stmt = $db->prepare($query);
$stmt->execute();
}
catch(PDOException $ex)
{
// Note: On a production website, you should not output $ex->getMessage().
// It may provide an attacker with helpful information about your code.
die("Failed to run query: " . $ex->getMessage());
}
// Finally, we can retrieve all of the found rows into an array using fetchAll
$rows = $stmt->fetchAll();
if ($admin == 1) {
$_SESSION['username'] = $user;
header("location: memberlist.php");
}
if ($admin == 0) {
$_SESSION['username'] = $user;
header("location: login.php");
}

Answer 1

Correct you code First:
Try this:
if ($admin == 1) {
$_SESSION['admin'] = $admin; //put you admin in session
header("location: memberlist.php");
}
if ($admin == 0) {
$_SESSION['user'] = $user; //here put your user in session
header("location: login.php");
}
if(empty($_SESSION['user'])) //if user is empty then it redirects to login page
{
header("Location: login.php");
die("Redirecting to login.php");
}
else if(!empty($_SESSION['admin'])) //if admin is not empty it goes to admin area
{
header("location: memberlist.php");
}
else if(!empty($_SESSION['user'])) //same here if user is present,then it leads to user area
{
header("Location: user.php");
}