PHP forces file downloading instead of sharing custom functions opened in the browser_PHP Tutorial

Sometimes we want content such as pictures, text documents, web pages, mp3, pdf, etc. to be downloaded directly when the corresponding link is clicked instead of displayed on the web page, then we need to forcefully set the header information. The following is a PHP function implementation code that will not produce garbled characters. Other programming languages ​​​​can also refer to it for writing and implementation.

Copy code The code is as follows:

/**
 * Downloader
 *
 * @param $file
 *  path to the file
 * @param $downloadfilename
 *  (null|string) the name you want to use for the file you will be downloaded.
 * (if you don't specify it, use the current file name)
 *
 * @return file stream
 */
function download_file($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;
}

}

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