php 파일 다운로드, php file download > Web 끄적임

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#### (1)
if (file_exists($file_path)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="'.urlencode(basename($file_name)).'"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file_path));
    readfile($file_path);
    exit;
}

#### (2)

if (file_exists($file_path)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header("Content-Type: application/force-download");
    header('Content-Disposition: attachment; filename="'.urlencode(basename($file_name)).'"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file_path));
    ob_clean();
    flush();
    readfile($file_path);
    exit;
}