login.php

<?php
session_start();

$user   = $_POST['user'];
$pass   = $_POST['pass'];

if ($user == 'abc' and $pass == '123'){

    $_SESSION['login'] = 1;
    $_SESSION['name'] = $user;

    }else{

        $_SESSION['login'] = 0;
        $_SESSION['name'] = '';

        }

?>