PHP Serve Compressed Images

[Ryois]

So I have a  PHP script that will serve users a photo based on a GET request. See spoiler for code:

Spoiler

<?php
$file = $_GET['i'];
$size = getimagesize($file);
$fp = fopen($file, "rb");
if ($size && $fp) {
    header("Content-type: {$size['mime']}");
    fpassthru($fp);
    exit;
} else {
	header("Content-type: image/png");
	header("HTTP/1.0 404 Not Found");
	readfile("https://i.ryois.me/404.png");
	die();
}
readfile("https://i.ryois.me/{$file}");
?>

 

 

Is there some way to add a GET like ?i=myfile.png&c=1 where c=1 will tell the script to compress the image before serving it to the user?

Im using PGP 7.1.7 on IIS.

[Brenz]

Why not just compress the actual image files?

[Cruorzy]

Compressing the image on upload will reduce a lot of server load.

But keep the original too,so you are able to show that too if you really want too.

 

Converting images to jpeg's will be already a good step.

[Dayo1337]

Look into imagejpeg() as said previously you can compress them on upload or you can do it on serve but save/cache the compressed image for later use. The process would go like 

 

<?php

	$file = "files/photos/source/" . $_GET["file"];
	$compressdFile = "files/photos/compressed/" . $_GET["file"];
	/* do security check here to make sure the user can access this file */ 
	
	if (file_exists($compressdFile)) {
		/* serve $compressdFile */
	} else {
		/* compress file */
		/* save compressed file to $compressdFile */
 		/* serve $compressdFile */
	}

?>

 

Or you can always compress on upload and still use this way to support already uploaded images

[MyName13]

Is there a reason why you can't compress the images before they are needed?

[Dayo1337]

3 hours ago, MyName13 said:

Is there a reason why you can't compress the images before they are needed?

You can but it adds an overhead on the CPU so as the site/application scales there will be more strain on the server. In the long run, it's cheaper to upgrade your storage rather than the CPU.