### 后臺登錄控制器 ``` <?php namespace app\admin\controller; use app\admin\model\AdminModel; use app\admin\validate\LoginValidate; use think\captcha\Captcha; use think\Controller; use think\Request; class Login extends Controller { /* * 登錄頁面 */ public function index() { return $this->fetch(); } /* * 登錄表單數據處理 */ public function save(Request $request) { $data = $request->param(); // 驗證碼的驗證 // 驗證數據 $validate = new LoginValidate(); if (!$validate->check($data)) { return ['code' => 0, 'msg' => $validate->getError()]; } // 查詢數據庫 $db = new AdminModel(); $res = $db->login($data); if ($res) { return ['code' => 1, 'msg' => '登錄成功']; } return ['code' => 0, 'msg' => '賬號或密碼錯誤']; } /* * 驗證碼 */ public function verify() { $config = [ 'fontttf' => '4.ttf', // 驗證碼字體大小 'fontSize' => 30, // 驗證碼位數 'length' => 4, // 關閉驗證碼雜點 'useNoise' => false, // 關閉驗證碼混淆線 'useCurve' => false, ]; $verify = new Captcha($config); return $verify->entry(); } /* * 退出 */ public function logout() { session('aid', null); session('aname', null); return ['code' => 1, 'msg' => '退出成功', 'url' => url('Login/index')]; } } ```