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$filename = "export"

header("Content-type: text/csv");
header("Content-Disposition: attachment; filename={$filename}.csv");
header("Pragma: no-cache");
header("Expires: 0");

outputCSV($array);

function outputCSV($data) {
  $outputBuffer = fopen("php://output", 'w');
  foreach($data as $val) {
    fputcsv($outputBuffer, $val);
  }
  fclose($outputBuffer);
}