troubleshoot this shortcode with variable

I am not sure if my brackets inside the [php] tags are messing up the code. Here is what I have:

[php]
$img_ids = 432,232;
do_shortcode('[gallery ids='.$img_ids.']'));
[php]

Please advise on how to fix
Thanks!

https://wordpress.org/plugins/allow-php-in-posts-and-pages/