PHP: File download doesnt download expected file

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Proper MIME media type for PDF files 3 answers

---

$filename = './images/upload/'.$mongoDbA['file'];

    $fileinfo = pathinfo($filename);
    $sendname = $fileinfo['filename'] . '.' . $fileinfo['extension'];

    header('Content-Type: application/pdf');
    header('Content-Disposition: attachment; filename="$sendname"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($filename));
    readfile($filename);
    exit;

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