PHP: create a tmp CSV file without creating a real file in file system

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ob_start();
$df = fopen('php://output', 'w');
fputcsv($df, array_keys(reset($yourData)), ';');
foreach ($yourData as $data) {
    fputcsv($df, $data, ';');
}
fclose($df);
$csv = ob_get_clean();