yii學習筆記--url解析

　　在通過yiic命令生成了一個app之後，我們通過瀏覽器訪問會看到這樣的一個頁面。

 

　　點選home時，url為：http://localhost/blog/index.php?r=site/index

　　點選about時，url為：http://localhost/blog/index.php?r=site/page&view=about

　　但是，實際上他們都對應於不同的指令碼。app在一個名叫 urlManager 的應用元件的幫助下，決定請求的控制和動作，以上的兩個請求都對應於同一個控制器site，我們可以在/protected/controllers/ 目錄下找到控制器：SiteController.php（如下），class SiteController 繼承於 Controller，在SiteController裡面會定義處理請求的動作方法，比如function actionIndex () {}；他用於處理url為：http://localhost/blog/index.php?r=site/index 這個請求。而對於url為：http://localhost/blog/index.php?r=site/page&view=about，我們並未找到 function actionPage () {}；而且我們可以看到與其他url不同的是，這個請求還附帶了一個引數 view=about，其實這類請求都在function actions () {};中進行處理，對於這個請求，它會到/protected/views/site/pages 下面尋找 about.php頁面。
    

?php

class SiteController extends Controller
{
        /**
         * Declares class-based actions.
         */
        public function actions()
        {
                return array(
                        // captcha action renders the CAPTCHA image displayed on the contact page
                        'captcha'=>array(
                                'class'=>'CCaptchaAction',
                                'backColor'=>0xFFFFFF,
                        ),
                        // page action renders "static" pages stored under 'protected/views/site/pages'
                        // They can be accessed via: index.php?r=site/page&view=FileName
                        'page'=>array(
                                'class'=>'CViewAction',
                        ),
                );
        }

        /**
         * This is the default 'index' action that is invoked
         * when an action is not explicitly requested by users.
         */
        public function actionIndex()
        {
                // renders the view file 'protected/views/site/index.php'
                // using the default layout 'protected/views/layouts/main.php'
                $this->render('index');
        }

        /**
         * This is the action to handle external exceptions.
         */
        public function actionError()
        {
                if($error=Yii::app()->errorHandler->error)
                {
                        if(Yii::app()->request->isAjaxRequest)
                                echo $error['message'];
                        else
                                $this->render('error', $error);
                }
        }/**
         * Displays the contact page
         */
        public function actionContact()
        {
                $model=new ContactForm;
                if(isset($_POST['ContactForm']))
                {
                        $model->attributes=$_POST['ContactForm'];
                        if($model->validate())
                        {
                                $name='=?UTF-8?B?'.base64_encode($model->name).'?=';
                                $subject='=?UTF-8?B?'.base64_encode($model->subject).'?=';
                                $headers="From: $name <{$model->email}>\r\n".
                                        "Reply-To: {$model->email}\r\n".
                                        "MIME-Version: 1.0\r\n".
                                        "Content-type: text/plain; charset=UTF-8";

                                mail(Yii::app()->params['adminEmail'],$subject,$model->body,$headers);
                                Yii::app()->user->setFlash('contact','Thank you for contacting us. We will respond to you as soon as possible.');
                                $this->refresh();
                        }
                }
                $this->render('contact',array('model'=>$model));
        }/**
         * Displays the login page
         */
        public function actionLogin()
        {
                $model=new LoginForm;

                // if it is ajax validation request
                if(isset($_POST['ajax']) && $_POST['ajax']==='login-form')
                {
                        echo CActiveForm::validate($model);
                        Yii::app()->end();
                }

                // collect user input data
                if(isset($_POST['LoginForm']))
                {
                        $model->attributes=$_POST['LoginForm'];
                        // validate user input and redirect to the previous page if valid
                        if($model->validate() && $model->login())
                                $this->redirect(Yii::app()->user->returnUrl);
                }
                // display the login form
                $this->render('login',array('model'=>$model));
        }

        /**
         * Logs out the current user and redirect to homepage.
         */
        public function actionLogout()
        {
                Yii::app()->user->logout();
                $this->redirect(Yii::app()->homeUrl);
        }
}