CakePHP 3，如何在沒有CTP的情況下渲染

Question

如何在沒有我的控制器嘗試加載不存在的.ctp文件的情況下渲染。

這是我的代碼：

 //without this, I get an error trying to load a non-existent .ctp file. When I include it, the browser does not render the PNG file. 
     $this->autoRender = false; 

     //... get avatar code 

     if (!file_exists($avatarPath)) 
      throw new Exception('Could not find file: '.$avatarPath); 

     $file = file_get_contents($avatarPath); 

     header('Content-Type: image/png'); 
     if ($file === false) 
      throw new Exception('file_get_contents failed on avatarPath'); 
     else 
      echo $file; 

當我使用$this->autoRender = false;，該header調用似乎被忽略。有任何想法嗎？

Answer 1

閱讀關於CakePHP的how to send files。讓我引用文檔爲您提供：

There are times when you want to send files as responses for your requests. You can accomplish that by using

public function sendFile($id) 
{ 
    $file = $this->Attachments->getFile($id); 
    $this->response->file($file['path']); 
    // Return response object to prevent controller from trying to render 
    // a view. 
    return $this->response; 
} 

As shown in the above example, you must pass the file path to the method. CakePHP will send a proper content type header if it’s a known file type listed in Cake\Network\Reponse::$_mimeTypes. You can add new types prior to calling Cake\Network\Response::file() by using the Cake\Network\Response::type() method.

If you want, you can also force a file to be downloaded instead of displayed in the browser by specifying the options:

$this->response->file(
    $file['path'], 
    ['download' => true, 'name' => 'foo'] 
);