Laravel download query results as CSV [duplicate] - php

Question

This question already has answers here:
How to create and download a csv file from php script?
(8 answers)
Closed 3 years ago.
I am trying to download a query as CSV and face currently two issues:
A file is created in the public folder. It contains the query data. That is really bad, because it should not exist in the public folder.
A file is also downloaded, but the downloaded file is empty.
Here is the function:
public function get_chatmessages(Request $data) {
try {
if ($data->chat_to_user) {
$result = DB::connection('mysql_live')->table('user_chatmessages')
->where(function($query) use($data) {
$query->where('from_user', $data->chat_from_user)->where('to_user', $data->chat_to_user);
})->orWhere(function($query) use($data) {
$query->where('to_user', $data->chat_from_user)->where('from_user', $data->chat_to_user);
})->orderBy('date_added', 'asc')->get();
} else {
$result = DB::connection('mysql_live')->table('user_chatmessages')
->where('from_user', $data->chat_from_user)
->orWhere('to_user', $data->chat_from_user)
->orderBy('date_added', 'asc')
->get();
}
//\Log::info($data);
//\Log::info($result);
$headers = array(
"Content-type" => "text/csv",
"Content-Disposition" => "attachment; filename=file.csv",
"Pragma" => "no-cache",
"Cache-Control" => "must-revalidate, post-check=0, pre-check=0",
"Expires" => "0"
);
$columns = array('from_user', 'to_user', 'message', 'date_added');
$callback = function() use ($result, $columns) {
$file = fopen('output_chat.csv', 'w');
fputcsv($file, $columns);
foreach($result as $res) {
fputcsv($file, array($res->from_user, $res->to_user, $res->message, $res->date_added));
}
fclose($file);
};
//return response()->download('output_chat.csv', 'DL_output_chat.csv', $headers);
//return response()->make($callback, 200, $headers);
return response()->stream($callback, 200, $headers);
} catch (\Exception $e) {
return redirect('home')->with('error', $e->getMessage());
}
return redirect('home')->with('error', 'Etwas ist schief gelaufen');
}

Answer 1

I made little changes in your snippet regarding php://output
$headers = [
"Content-type" => "text/csv",
"Content-Disposition" => "attachment; filename=output_chat.csv", // <- name of file
"Pragma" => "no-cache",
"Cache-Control" => "must-revalidate, post-check=0, pre-check=0",
"Expires" => "0",
];
$columns = ['from_user', 'to_user', 'message', 'date_added'];
$callback = function () use ($result, $columns) {
$file = fopen('php://output', 'w'); //<-here. name of file is written in headers
fputcsv($file, $columns);
foreach ($result as $res) {
fputcsv($file, [$res->from_user, $res->to_user, $res->message, $res->date_added]);
}
fclose($file);
};

Answer 2

For Laravel, there are many packages which provide us such implementations.
And for you to create download csv file with your database records you can use Laravel Excel package.
This package has many useful features. try to use it.

Answer 3

You can decide where you save files - you can do this using Laravel's Storage facade.
private function pathToPrivateStorage()
{
return '/private/CSVs';
}
Storage::put($this->pathToPrivateStorage, $YOURCSVFILE);
You can read more about storage here.

Answer 4

Try $file = fopen('php://output', 'w'); in place of $file = fopen('output_chat.csv', 'w');