How to give a download option [closed]

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I am making a site on which I'll give users the option to download software.

I want to know what to do for that.

For example:

To download xyz software click here

and if the user clicks on it, the download starts.

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<p>You can download <a href="/url/to/the/file/to/download">the thing that you want</a>

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You can use this function:

function download($path, $filename) {

  header('Content-Type: application/force-download');
  header('Content-Disposition: attachment;filename="'. $filename . '"');
  $fp=fopen($path . "/". $filename, 'r');
  fpassthru($fp);
  fclose($fp);

}

Next, you have to set values for $path & $filename & call the above function like this:

$path = $_SERVER['DOCUMENT_ROOT']."/your_download_directory";
$filename = xyz_software.zip;

download($path, $filename);