Custom function code for php to force file download

Sometimes you want to download directly when clicking the corresponding link instead of displaying it on the web page, then you need to forcefully set the header information.

Share a piece of PHP function implementation code that does not produce garbled characters to achieve forced downloading of files.

Example, PHP code to implement forced downloading of files.

/**
 * Downloader
 *
 * @param $file
 * path to the file
 * @param $downloadfilename
 * (null|string) the name you want to use for the file to be downloaded.
 * (if you don't specify it use current file name)
 *
 * @return file stream
*/ bbs.it-home.org
function download_file($archivo, $downloadfilename = null) {
 if (file_exists($archivo)) {
 $downloadfilename = $downloadfilename !== null ? $downloadfilename : basename($archivo);
 header('Content-Description: File Transfer');
 header('Content-Type: application/octet-stream');
 header ('Content-Disposition: attachment; filename=' . $downloadfilename);
 header('Content-Transfer-Encoding: binary');
 header('Expires: 0');
 header('Cache-Control: must- revalidate, post-check=0, pre-check=0');
 header('Pragma: public');
 header('Content-Length: ' . filesize($archivo));
 ob_clean();
 flush ();
 readfile($archivo);
 exit;
 }
}