Yii2 使用二 了解MVC

一、目录结构：

模型类：models/

视图文件：views/

二、MVC示例：

在controllers下的SiteController.php里新增方法：

    //action后面的操作映射为say-hello    public function actionSayHello($message='World'){    return $this->render('say',['message'=>$message]);    }

在views/site下新建视图say.php，内容：

<?phpuse yii\helpers\Html;?><?=Html::encode($message)?>

输入网址：http://test.com/index.php?r=site/say-hello&message=OK 

查看输出结果

三、Form示例

修改SiteControlloer.php：

<?phpnamespace app\controllers;use Yii;use yii\filters\AccessControl;use yii\web\Controller;use yii\filters\VerbFilter;use app\models\LoginForm;use app\models\ContactForm;use app\models\EntryForm;class SiteController extends Controller{    public function behaviors()    {        return [            'access' => [                'class' => AccessControl::className(),                'only' => ['logout'],                'rules' => [                    [                        'actions' => ['logout'],                        'allow' => true,                        'roles' => ['@'],                    ],                ],            ],            'verbs' => [                'class' => VerbFilter::className(),                'actions' => [                    'logout' => ['post'],                ],            ],        ];    }    public function actions()    {        return [            'error' => [                'class' => 'yii\web\ErrorAction',            ],            'captcha' => [                'class' => 'yii\captcha\CaptchaAction',                'fixedVerifyCode' => YII_ENV_TEST ? 'testme' : null,            ],        ];    }    public function actionIndex()    {        return $this->render('index');    }    public function actionLogin()    {        if (!\Yii::$app->user->isGuest) {            return $this->goHome();        }        $model = new LoginForm();        if ($model->load(Yii::$app->request->post()) && $model->login()) {            return $this->goBack();        } else {            return $this->render('login', [                'model' => $model,            ]);        }    }    public function actionLogout()    {        Yii::$app->user->logout();        return $this->goHome();    }    public function actionContact()    {        $model = new ContactForm();        if ($model->load(Yii::$app->request->post()) && $model->contact(Yii::$app->params['adminEmail'])) {            Yii::$app->session->setFlash('contactFormSubmitted');            return $this->refresh();        } else {            return $this->render('contact', [                'model' => $model,            ]);        }    }    public function actionAbout()    {        return $this->render('about');    }    //action后面的操作映射为say-hello    public function actionSayHello($message='World'){    return $this->render('say',['message'=>$message]);    }    public function actionEntry(){    $model=new EntryForm;    if($model->load(Yii::$app->request->post()) && $model->validate()){    return $this->render('entry-confirm',['model'=>$model]);    }else    {    return $this->render('entry',['model'=>$model]);    }    }}

新增ModelEntryForm.php：

<?phpnamespace app\models;use yii\base\Model;class EntryForm extends Model{public $name;public $email;public function rules(){return [[['name','email'],'required'],['email','email']];}}

新增视图entry.php：

<?php use yii\helpers\Html;use yii\widgets\ActiveForm;?><?php $form=ActiveForm::begin();?><?= $form->field($model,'name')?><?= $form->field($model,'email')?><div class="form-group"><?=Html::submitButton('Submit',['class'=>'btn btn-primary'])?></div><?php ActiveForm::end();?>

新增视图entry-confirm.php：

<?phpuse yii\helpers\Html;?><p>You have entered the following information:</p><ul><li><label>Name</label>:<?= Html::encode($model->name)?></li><li><label>Email</label>:<?=Html::encode($model->email)?></ul>

现在目录结构是这样的：

测试：http://test.com/index.php?r=site/entry