session_start();
$usr = new Users;
$usr->storeFormValues( $_POST );
if( $usr->userLogin() ) {
header( 'Location: /user/' ) ;
$_SESSION["loggedIn"] = true;
$_SESSION['username'] = $_POST['username'];
$_SESSION['password'] = $_POST['password'];

} else {
echo '<center>'."<font color='red'>Sorry, Incorrect Username or Password <br> Please Try Again </br> </font>".'</center>';
}
}

<?php
    //set off all error for security purposes
    error_reporting(E_ALL);


    //define some contstant
    define( "DB_DSN", "mysql:host=localhost;dbname=dbname1" );
    define( "DB_USERNAME", "" );
    define( "DB_PASSWORD", "" );
    define( "CLS_PATH", "class" );

    //include the classes
    include_once( CLS_PATH . "/user.php" );


?>

<?php

session_start();

// redirects to user to the login.php page if user is not logged in

if (!isset($_SESSION['loggedIn'])){
header("location:  /login.php");
}
?>