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我以前是使用CFormModel來(lái)上傳圖片（單張）。比如RegisterForm來(lái)注冊(cè)用戶上傳照片并使用縮略圖：

<?php
class RegisterForm extends CFormModel
{
    public $email;
    public $password;
    public $gender;
    public $homeland;
    public $iemi;
    public $registerDate;
    public $wentWhere;
    public $birthday;
    public $avatar; //頭像，其最終結(jié)果應(yīng)該是存儲(chǔ)的Url
    public $thumb;//縮略圖
    private $_identity;
    public function rules()
    {
        return array(

            array('email', 'required'),
            array('email','email','message'=>'email的格式不合法'),
            array('password', 'required'),
            array('gender','in','range'=>array(0,1)),
            array('homeland','required','message'=>'家鄉(xiāng)必填，而且不容易更改'),
            array ('homeland','validateHome'),
            array('imei','required','message'=>'imei必填'),
            array('birthday','required','message'=>'birthday必填'),
            array('avatar','file','message'=>'必須設(shè)置一個(gè)頭像')
        );
    }

    /**
     * Declares attribute labels.
     */
    public function attributeLabels()
    {
        return array(
            'email'=>'用戶名/郵箱/手機(jī)號(hào)/漫游號(hào)',
            'password'=>'密碼',
            'gender'=>'性別',
            ''
        );
    }

    /**
     * Authenticates the password.
     * This is the 'authenticate' validator as declared in rules().
     */
    public function authenticate($attribute,$params)
    {
        if(!$this->hasErrors())
        {
            $this->_identity=new UserIdentity($this->username,$this->password);
            if(!$this->_identity->authenticate())
                $this->addError('password','Incorrect username or password.');
        }
    }

    /**
     *     驗(yàn)證家鄉(xiāng)是否合法。擴(kuò)展到地級(jí)市
     *
     *
     */
    public   function validateHome(){

          $this->homeland;


          $this->addError('homeland','家鄉(xiāng)不合法啊');



            }
    /**
     * Logs in the user using the given username and password in the model.
     * @return boolean whether login is successful
     */
    public function login()
    {
        if($this->_identity===null)
        {
            $this->_identity=new UserIdentity($this->username,$this->password);


            $this->_identity->setPersistentStates(array());
            $this->_identity->authenticate();
        }
        if($this->_identity->errorCode===UserIdentity::ERROR_NONE)
        {
            $duration=3600*24*10; // 10 days

            Yii::app()->user->login($this->_identity,$duration);
            return true;
        }
        else
            return false;
    }
}

然后在Controller里面：

public function  actionRegister()
    {
        $registerForm = new RegisterForm();
        if (isset($_POST['RegisterForm'])) {
            $registerForm->attributes = $_POST['RegisterForm'];
            $registerForm->avatar = CUploadedFile::getInstance($registerForm, 'avatar');
            if ($registerForm->avatar) {
                $preRand = time() . mt_rand(0, 99999);
                $imageName='img_big'.$preRand.$registerForm->avatar->extensionName;
                $registerForm->avatar->saveAs('uploads/' . $imageName);
                $registerForm->avatar = $imageName;
            }
            $path = dirname(Yii::app()->BasePath) . '/uploads/';
            $thumb = Yii::app()->thumb; //與 $thumb=new Cthumb()有什么區(qū)別？
            $thumb->image = $path . 'img_small' . $preRand . $registerForm->avatar->extensionName;
            $thumb->width = 130;
            $thumb->height = 95;
            $thumb->mode = 4;
            $thumb->directory = $path;
            $thumb->defaultName = $preRand;
            $thumb->createThumb();
            $thumb->save();
            $registerForm->thumb = $thumb->image;
            $registerForm->registerDate = time();
//save方法會(huì)自動(dòng)驗(yàn)證
            if ($registerForm->save() && $registerForm->login()) {
                Yii::app()->db->getLastInsertID(); //取得插入的Id。但是
            }

        }

上傳的時(shí)候主要是這里：

$registerForm->avatar = CUploadedFile::getInstance($registerForm, 'avatar');

但是現(xiàn)在遇到了一個(gè)問(wèn)題。就是$registerForm繼承了CFormModel，這個(gè)save方法是CActiveRecord的，為什么save方法就調(diào)用了呢？

此外，如果我要多文件上傳，是不是

$file1=CUploadedFile::getInstance($registerForm, 'file1');
$file2=CUploadedFile::getInstance($registerForm, 'file2');

就可以了？