csv export not working with symfony 3 - symfony

Question

I try to do a csv export on my symfony project and i think that something is wrong because nothing happens and i have no error...??
public function exportCsv($customers)
{
$fileName = "export_" . date("d_m_Y") . ".csv";
$response = new StreamedResponse();
$response->setCallback(function() use ($customers){
$handle = fopen('php://output', 'w+');
// Nom des colonnes du CSV
fputcsv($handle, array('Name',
'Adress',
'City',
'Code'
), ';');
//Champs
foreach ($customers as $index => $customer)
{
//dump($client);die();
fputcsv($handle,array(
$customer->getName(),
$customer->getAdress(),
$customer->getCity(),
$customer->getCode(),
),';');
}
fclose($handle);
});
$response->setStatusCode(200);
$response->headers->set('Content-Type', 'text/csv; charset=utf-8', 'application/force-download');
$response->headers->set('Content-Disposition','attachment; filename='.$fileName);
return $response;
}
I call this function in my controler like this:
if (isset($_POST['export']))
{
$export = $exp->exportCsv($customers);
}
Have you any idea, please???

Answer 1

If you want to see what happened in your streamed response and what is the error, you just have to call the callback function outside the response.
$callback = function() use ($customers){
$handle = fopen('php://output', 'w+');
// Nom des colonnes du CSV
fputcsv($handle, array('Name',
'Adress',
'City',
'Code'
), ';');
//Champs
foreach ($customers as $index => $customer)
{
//dump($client);die();
fputcsv($handle,array(
$customer->getName(),
$customer->getAdress(),
$customer->getCity(),
$customer->getCode(),
),';');
}
fclose($handle);
};
$callback();exit;
And after just delete the last line and insert the callback function inside the StreamedResponse object $response->setCallback($callback);