mysql - How to export a Base64 string to a file, on server side, without saving it in web server, directly by PHP?

Question

I am using PHP and MySQL for my programming.

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I have stored some Base64 strings (which are encoded from files). I know that base64_decode(); can decode Base64 strings to files.

Now, I want to decode these Base64 strings to files, by PHP, without saving it in my web server; but, web browser can download it from web link (http://example.com/save.php?fileid=23413).

In my PHP page, http://example.com/save.php?fileid=23413, I did:

1. I can use echo(); for printing Base64 strings. So, there is no problem with my MySQL queries.
2. I have delete echo(); from my PHP page.
3. I tried to use base64_decode(); to decode Base64 strings to files. I want when I nagivate to this page, it will export a file. But, It returns an empty page.

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Can you help me to decode Base64 strings to files, by PHP, without saving it in my web server, and web browser can download it from web link (http://example.com/save.php?fileid=23413)?

Answer 1

Try adding headers to the script before echoing the output

header('Content-Description: File Transfer');
header("Content-type: application/octet-stream");
header("Content-disposition: attachment; filename= ".$file."");
echo base64_decode($file);