PHP GD .ico处理

Question

Users of my PHP webapp are permitted to upload PNG and JPEG images. Upload algorithm is following:

1. check extension by file name parsing
2. check extension by getimagesize()
3. recreate image by imagecreatefrompng()/imagepng() (imagecreatefromjpeg()/imagejpeg())
4. rename image
5. save to filesystem

Image recreation is used for security. Everything works fine. But now i need this algorithm to handle .ico files. It seems like GD doesn't work with .ico (there is no function like imagecreatefromico()), so i don`t know how to implement step 3 of my algorithm.

Thanks for any help or advice.

Answer 1

See https://github.com/lordelph/icofileloader for a composer-installable class which can load .ico files into a GD image.

For example:

$loader = new Elphin\IcoFileLoader\IcoFileService;
$im = $loader->extractIcon('/path/to/icon.ico', 32, 32);

See documentation for other methods of analysing and extracting images from the icon file.