yii实现图片上传及缩略图生成的方法

这篇文章主要介绍了yii实现图片上传及缩略图生成的方法,详细分析了图片的上传及缩略图的生成原理与实现方法,是非常实用的技巧,需要的朋友可以参考下

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:

<?php
/**
 * TestController.php
 * Created on: 2014-1-26 12:59:36 by Outsider
 */
class TestController extends CController {
 
    /**
     * 缩略图片生成
     * @ path 图片路径
     * @ width 图片宽度
     * @ height 图片高度
     */
    public function actionGetThumb($path, $w, $h) {
        $file_name = md5($path . $w . $h);
        if (file_exists('./temp/' . $file_name . '.jpg')) {
            header('location:/temp/' . $file_name . '.jpg');
            Yii::app()->end();
        }
        Yii::import("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:

<?php
class Upload extends CFormModel {
 
    public $file;
 
    public function rules() {
        return array(
            array('file', 'file', 'types' => 'jpg, gif, png,zip'),
        );
    }
}

自定义图片大小，缩略图自动生成

<?php
/**
 * list.php
 * Created on: 2014-1-26 13:12:01 by Outsider
 */
?>
<?php foreach ($list as $v): ?>
    <img src="<?php echo Yii::app()->createUrl('test/getThumb', array('path' => '/uploads' . $v['path'], 'w' => '150', 'h' => '150')) ?>">
<?php endforeach; ?>

图片上传表单：

<?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。