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:<?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:
复制代码 代码如下:<?php
class Upload extends CFormModel {

public $file;

public function rules() {
return array(
array('file', 'file', 'types' => 'jpg, gif, png,zip'),
);
}
}
图片显示页面：

自定义图片大小，缩略图自动生成
复制代码 代码如下:<?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：
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。