CSV export with StreamedResponse - php

Question

I have to create a CSV export. I found this awesome service and I tried to adapt it to my case. This works very well on my own computer (windows 7, wamp 2.5 not modified) but when I put it on the server (Ubuntu 14.04.4 LTS, PHP 5.5.9), this doesn't work anymore. It seems that it tries to export an infinite flux of data and it might crash the server. I work on Symfony 3.1.1. Here is the code of my class :
public function exportCsv($affairesQuery, $em)
{
$response = new StreamedResponse(function() use($affairesQuery, $em) {
$results = $affairesQuery->iterate();
$handle = fopen('php://output', 'r+');
fputs($handle, $bom =( chr(0xEF) . chr(0xBB) . chr(0xBF) ));
fputcsv($handle, [
// My long list of headers
],
";");
while (false !== ($row = $results->next())) {
fputcsv($handle, $row[0]->toArray(), ";");
$em->detach($row[0]);
}
fclose($handle);
});
$response->setStatusCode(200);
$response->headers->set('Content-Type', 'application/force-download');
$response->headers->set('Content-Disposition','attachment; filename="Planning du '.date("Y-m-d h:i:s").".csv");
return $response;
}
UPDATE :
I tried to make goodby/csv working in my case, as said in comment below, but I got exactly the same issue. Which is very strange, because this isn't the same spirit.
public function exportCsv($affairesQuery, $em)
{
$stmt = $this->dbConnection->prepare($affairesQuery->getQuery()->getSQL());
$n = 1;
foreach($affairesQuery->getQuery()->getParameters()->toArray() as $value)
{
$stmt->bindValue($n, $value->getValue());
$n++;
}
$response = new StreamedResponse();
$response->setStatusCode(200);
$response->headers->set('Content-Type', 'text/csv');
$response->headers->set('Content-Disposition','attachment; filename="Planning du '.date("Y-m-d h:i:s").".csv");
$response->setCallback(function() use($stmt) {
$config = new ExporterConfig();
$exporter = new Exporter($config);
$exporter->export('php://output', new PdoCollection($stmt->getIterator()));
});
$response->sendContent();
return $response;
}