<?php include_once 'db/Database.php'; $flag = false; if (isset($_POST['login_button'])) { $db = new Database(); if ($db->check_login($_POST)) { session_start(); $_SESSION['logged_in'] = true; header("location: home.php"); } else { $flag = true; } } ?> <!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title></title> <link href="assets/css/bootstrap.css" type="text/css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row"> <div class="col-md-6"> <form action="login.php" method="post"> <?php if ($flag) { echo "Either user name or password is wrong"; }