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HomeBackend DevelopmentPHP TutorialZend Framework里怎么实现文件下载功能

Zend Framework里如何实现文件下载功能
如题,我的目的是想要在一个控制器的方法里实现文件下载
该下载的文件不是本地目录上的文件,而是在控制器的方法里临时的生成的数据文件。
PHP在不用ZF的情况下是可以用设置header信息来让浏览器实现下载的功能,
header("Content-type: text/plain");       
header("Accept-Ranges: bytes");        
header("Content-Disposition: attachment; filename=".$filename);        
header("Cache-Control: must-revalidate, post-check=0, pre-check=0" );        
header("Pragma: no-cache" );        
header("Expires: 0" ); 
就像这样,但是在ZF里我直接拿这段代码放到某个控制器的方法里,比如downloadController的downloadAction()里,同样是这样设置头信息,最后打印数据,
print $data; 
却始终不能实现下载。
请问高手们应该怎么做到在zend framework里实现下载,或者ZF有没有自带的关于文件下载的。看了手册,貌似只有文件上载的。没有下载
------解决方案--------------------
需要禁用layout,viewRenderer
public function downloadAction() { 
  $this->_helper->getHelper ( 'layout' )->disableLayout ();
  $this->_helper->getHelper ( 'viewRenderer' )->setNoRender (); 

  。。。

}

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