本文实例讲述了利用yii框架来实现图片上传功能并在上传成功之后自动生成缩略图的方法，分享给大家供大家参考。具体实现方法如下：

Action文件:
复制代码 代码如下:<"ext.EPhpThumb.EPhpThumb");
        $thumb = new EPhpThumb();
        $thumb->init();
        $thumb->create('.' . $path)
                ->adaptiveResize($w, $h)
                ->save('./temp/' . $file_name . '.jpg')
                ->show();
    }
 
    /*
     * 图片显示
     */
 
    public function actionList() {
        $attache = Attache::model();
        $list = $attache->findAll();
        $this->render('list', array('list' => $list));
        die;
    }
 
    /**
     * 文件上传
     */
    public function actionIndex() {
        $path = getcwd() . 'uploads';
        $dir = DIRECTORY_SEPARATOR . date('Y') . DIRECTORY_SEPARATOR . date('m');
        $dir = str_replace("\", "/", $dir);
        $uploads_dir = str_replace("\", "/", $path . $dir);
        if (!is_dir($uploads_dir) || !is_writeable($uploads_dir)) {
            mkdir($uploads_dir, 0777, TRUE);
            touch($uploads_dir . '/index.html');
        }
        $uploaded = false;
        $model = new Upload();
        if (isset($_POST['Upload'])) {
            $model->attributes = $_POST['Upload'];
            $file = CUploadedFile::getInstance($model, 'file');
            $newName = substr(md5($file->extensionName . round((microtime(true) * 1000))), 0, 17) . '.' . $file->extensionName; 
            $file_name = $uploads_dir . '/' . $newName;
            if ($model->validate()) {
                $attache = new Attache();
                $uploaded = $file->saveAs($file_name, TRUE);
                $attache->name = $file->getName();
                $attache->path = $dir . '/' . $newName;
                $attache->create_time = time();
                $attache->save();
            }
        }
 
        $this->render('index', array(
            'model' => $model,
            'uploaded' => $uploaded,
            'dir' => $uploads_dir,
        ));
    }
}

Upload.php:
复制代码 代码如下:<"codetitle">复制代码 代码如下:<"<">
<"codetitle">复制代码 代码如下:<?php if($uploaded):?>
<p>File was uploaded. Check <?php echo $dir?>.</p>
<?php endif ?>
<?php echo CHtml::beginForm('','post',array
        ('enctype'=>'multipart/form-data'))?>
    <?php echo CHtml::error($model, 'file')?>
    <?php echo CHtml::activeFileField($model, 'file')?>
    <?php echo CHtml::submitButton('Upload')?>
<?php echo CHtml::endForm()?>

希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。