How to change someone else's image from HTTP to HTTPS?

Question

PHP

Hello. Straight to the point. I have a website with ssl certificate installed but images without certificate. The problem is that the images are of course blocked because of the mixed connection.
I even experimented. that is, uploaded the image to the server, and then output it as https
Here:

if(isset($_GET['link']))
    {
        $header = get_headers($_GET['link']);
        if(isset($header[2]) && $header[2] == 'Content-Type: image/jpeg')
        {
            header('Content-Type: image');
            

                $lines = @file($_GET['link']);
                $file = fopen($_SERVER['DOCUMENT_ROOT'].'/imgitem/cache/'.md5($_GET['link']), 'w');
                if($lines != NULL)
                {
                    foreach ($lines as $line_num => $line) {
                        echo $line;
                    }
                }
        }
    }

But such a method is resource-intensive!
I have been doing php js html for four months, I don’t even know how to put the question in this matter correctly, tell me in which direction I should go.
I almost forgot!
The image resource is not mine, so the certificate installation will not work.

Right now I'm thinking about downloading all the images using the method above. by adding a list of images and looping through them to load
Links to images there are about 32,000 of them

Answer 1

Just proxy pictures through your server and don't worry.

Answer 2

Alien - no way.
As an option, you can consider the possibility not to parasitize on someone else's content, but to do something of your own

Answer 3

php proxy on the git, lots of examples
and strreplace everything ;)