//实例化上传类
$upload = new Zend_File_Transfer();
//设置过滤器，大小限制为5M，格式为jpg,gif,png
$upload->addValidator('Size',false,5 * 1024 * 1024);
$upload->addValidator('Extension','jpg,png');
if (!$upload->isValid()) {
print '文件大小或格式不符合';
exit();
}

//获取上传的文件表单，可以有多项
$fileInfo = $upload->getFileInfo();
//获取后缀名，这里pic为上传表单file控件的name
$ext = $this->getExtension($fileInfo['pic']['name']);
//定义生成目录
$dir = './upload' . date('/Y/m/d/');
//文件重新命名
do {
$filename = date('His') . rand(100000,999999) . '.' . $ext;
} while (file_exists($dir . $filename));

//如果目录不存在则创建目录
$this->makeDir($dir);
//将文件正式写入上传目录
$upload->setDestination($dir);
$upload->addFilter('Rename',array('target' => $filename,'overwrite' => true));
if (!$upload->receive()) {
print '上传图片失败';
exit();
}

print $filename;

/**
* 获取文件扩展名
*
* @param string $fileName
* @return string
*/
public function getExtension($fileName) {
if (!$fileName) {
return '';
}
$exts = explode(".",$fileName);
$ext = end($exts);
return $ext;
}

/**
* 创建目录
*
* @param string $path
* @return boolean
*/
public function makeDir($path) {
if (DIRECTORY_SEPARATOR == "\\") {//windows os
$path = iconv('utf-8','gbk',$path);
}
if (!$path) {
return false;
}
if (file_exists($path)) {
return true;
}
if (mkdir($path,0777,true)) {
return true;
}
return false;
}