Question

I have a lengthy import process and I am trying to use the new StreamedResponse available in Symfony 2.1 to report some feedback about the task to the user but the response is not being streamed (I get all the content at once at the end of processing). This is my code in my controller:

            $em = $this->getDoctrine()->getEntityManager();
            $response = new StreamedResponse();
            $response->setCallback(function () use ($em) {
                $file = fopen(sys_get_temp_dir().'/categories.txt', 'r');
                $lineNum = 0;
                while ($line = fgets ($file)) {
                    $category = new Category();
                    $fields = explode("\t",$line);
                    $category->setFullId($fields[0]);
                    $category->setName($fields[2]);
                    $category->setFullName($fields[4]);
                    $em->persist($category);
                    if ($lineNum%100==0) {
                        echo 'Processing Line: '.$lineNum.'<br>';
                        flush();                            
                        $em->flush();
                    }
                    $lineNum++;
                }
                fclose($file);
            });
            return $response;                 

Any idea what may be wrong?

Answer 1

OK, I found it: you need to call both ob_flush() and flush().