Media Library thumbnails broken with PHP 8

[knieriemrt]

WordPress 5.8.1
PHP 8.0.10
All plugins disabled
Default Theme

I upgraded our PHP to 8.0.10 and WordPress is unable to generate thumbnails for images I upload into the media library. I tried a thumbnail regenerating plugin and that did not work either. I tried PHP 8.0.3 and it didn't work. I dropped the PHP version down to 7.4.11 and it started working again.

I am not the only person with this problem:
​https://wordpress.org/support/topic/wordpress-5-8-5-7-media-library-issue-with-php-8-0/#post-14855889

[Hareesh Pillai]

Hello @knieriemrt, Welcome to WordPress Core Trac.
Thanks for trying out the debug steps and the detailed report.

Just wanted to report that I tried to replicate this in my local install (PHP v 8.0.3), however, I do not face the said issue.

I'm starting to think if this has got something to do with the way the server is set up. I'd wait for other reviewers to share their views.

[knutsp]

This is most likely caused by the PHP configuration, like missing recommended extensions. Tools - Site Health - Info - Media handling has more info.

[knieriemrt]

Thanks for the responses. After enabling the GD extensions I am closer. I can upload images but the thumbnails don't work right until I edit the image, then rotate it left then back right and save it. After I do that the image seems fine. Any ideas why the act of uploading doesn't generate the thumbnails but saving from the image editor does?

[antpb]

Hi @knieriemrt ! There have been a bunch of PHP 8 fixes that have happened over the last year. Are you having these issues still in WordPress 6.2? The release candidate for that version is out and you can install using the Beta Tester Plugin: ​https://wordpress.org/plugins/wordpress-beta-tester/

If this is no longer valid, just let us know and we can get this closed out. If no response in the next week or so we're going to close this out to keep our backlog true. Thanks!

[knieriemrt]

Hello @antpb,

I just uploaded an image and the thumbnail worked fine. Somewhere along the way in the last 18 months it was fixed. I am currently running PHP 8.2.1 and WordPress 6.1.1.

Thanks