if($_SERVER['REQUEST_METHOD']=="GET") {
        session_start();
        if (isset($_SESSION["user"])){
            header('Location: home.php');
        }
        else{
            http_login_page();
        }
    }
    else {
        require("dbconnection.php");
        $usernameQuery = $db->query("SELECT * FROM users WHERE login = '{$_POST['user']}'");
        $tableau = Array();
        $tableau = $usernameQuery->fetchArray(SQLITE3_ASSOC);
        if ($tableau == false){
            http_login_page();
            http_login_page_fail();
        }else{
            if ($tableau['nb_errors']==2){
                http_login_page();
                http_login_page_fail();
                http_login_page_warning();
            }else{
                if ($tableau['password']!="{$_POST['password']}"){
                    $db->exec("UPDATE users SET nb_errors = nb_errors + 1 WHERE login='{$_POST["user"]}'");
                    http_login_page();
                    http_login_page_fail();
                }
                if ($tableau['password']=="{$_POST['password']}" and $tableau[disabled]==0 and $tableau['blocked']==0){
                    $_SESSION['user']="{$_POST['user']}";
                    $_SESSION['firstname']=$tableau['firstname'];
                    $_SESSION['lastname']=$tableau['lastname'];
                    header('Location: home.php');
                }
            }

        }
    }