login.php

<?php include("includes/header.php") ?>

<?php

if($session->is_signed_in()){
    redirect("index.php");
}

if(isset($_POST['submit'])){
    $username = trim($_POST['username']);
    $password = trim($_POST['password']);

    //check the database user
    $user_found = User::verify_user($username,$password);


    if($user_found){
        $session->login($user_found);
        redirect("index.php");
    }else{
        $the_message = "Your password or username are incorrect";

    }
}else{
    $the_message = "";
    $username = "";
    $password ="";
}

?>

<div class="col-md-4 col-md-offset-3">

    <h4 class="bg-danger"><?php echo $the_message; ?></h4>

        <form id="login-id" action="" method="post">

            <div class="form-group">
                <label for="username">Username</label>
                <input type="text" class="form-control" name="username">

            </div>

            <div class="form-group">
                <label for="password">Password</label>
                <input type="password" class="form-control" name="password">
            </div>

            <div class="form-group">
            <input type="submit" name="submit" value="Submit" class="btn btn-primary">

            </div>

        </form>

</div>