登录角色/级别的用户

Question

嘿我正在尝试根据（管理员，用户）

这样的角色进行登录

登录工作正常但如果我想检查用户角色则无效。

<?php
$host     = "localhost";
$user     = "root";
$password = "";
$database = "dbtest";
$db       = new mysqli($host, $user, $password, $database);
session_start();
if ($_POST['username'] != "" && $_POST['password'] != ""):
                extract($_POST);
                $username     = mysqli_real_escape_string($db, $_POST['username']);
                $pass_encrypt = md5(mysqli_real_escape_string($db, $_POST['password']));
                $fetch        = $db->query("SELECT * FROM `users` WHERE username='$username' AND `password` = '$pass_encrypt'");
                $count        = mysqli_num_rows($fetch);
                if ($count == 1):
                                $row                        = mysqli_fetch_array($fetch);
                                $_SESSION['login_username'] = $row['username'];
                                $_SESSION['sess_userrole']  = $row['role'];
                //echo $_SESSION['sess_userrole'];

                //session_write_close();
                                if ($_SESSION['sess_userrole'] == "admin") {
                                                header('Location: admin_page.php');
                                } else {
                                                header('Location: user_page.php');
                                }
                                echo 1;
                else:
                                echo 0;
                endif;
else:
                header("Location:lg.php");
endif;
?>

我的桌子看起来像 id，用户名，密码，角色（其中密码是md5哈希）