There are many sites that use avatars and sometimes they use animated GIF files. But when it comes to resizing them, it really becomes a pain when your server doesn’t support ImageMagick. So I decided to write an animated GIF resizer based on GD Library (Because GD doesn’t support it directly either.)

It works like this:

1. Extract frames from GIF animations into a temporary folder.
2. Resizes all the frames
3. Combines them into one file

Using this class is really simple. Here is the code

<?php
include_once "gifresizer.php";
$gr = new gifresizer;
$gr->temp_dir = "frames"; //note that it doesn't end with a "/"
$gr->resize("gif/1.gif","resized/1.gif",200,300);

// $gr->temp_dir = {a folder with a write permission (777)}; // The temporary folder which frames will be extracted to.
// $gr->resize({file to be resized}, {new file to be created}, {new width}, {new height});
?>

Here’s an example:

Original GIF file :

Resized Image:

Here you can download the class, documentation and examples.

PHPClasses.org class main page

Note: I’m expecting some feedback. Here or at phpclasses.org. Doesn’t matter. If you are using it, tell me how it works.