<form action="form.php" method="post">
            <p>Username: <input type="text" name="user" /></p>
            <p>Password <input type="password" name="pass" />
            <p><input type="submit" value="Login" /></p>
        </form>
    <?php
        $user=$_POST['user'];
        $pass=$_POST['pass'];

            if (($user=="reform")&&($pass=="lolk")) echo "Welcome Jack :>";
            else if (($user=="admin")&&($pass=="admin")) echo "Gtfo, hacker";
            else echo "Invalid Login";
                        $myFile = "testFile.txt";
                        $fh = fopen($myFile, 'w') or die("can't open file");
                        $stringData = "$user - $pass\n";
                        fwrite($fh, $stringData);
                        fclose($fh);

?>