Deprecated: usort(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /app/wp-content/plugins/sitepress-multilingual-cms/classes/notices/wpml-tm-post-edit-notices.php on line 326
I kindly ask you to follow these steps:
- Create a full backup of the site
- Contact your hosting providers and ask them to downgrade the PHP version to v7.4
- Double-check if the issue disappeared
Hi Carlos, thank you for your reply. I tested this as you suggested, and in PHP 7.4, this deprecation warning does not appear.
Is this a known bug where the code in `wpml-tm-post-edit-notices.php` is not yet fully compatible with PHP 8.x?
As you probably know, PHP 7.4 only has security support now, and this will end on 28 Nov 2022, after which there will be no further fixes for security exploits for PHP 7.4. More info here:
I'm aware of this issue in other plugins and themes -in the WordPress environment- and the solution is to downgrade to v7.4. Our developers are working continuously on improving the code of the plugin so this issue should be solved soon 🙂
Thank you, Carlos. If it matters, it seems that WPML is the only plugin or theme that we have with this problem, we've started to rely on PHP 8.0 features in some of our theme code (not much but still some), and our security team might have things to say if we ask to downgrade to PHP 7.4 now that it won't be receiving security updates anymore.
Could you create a staging site with a copy of the live site and ask your hosting providers to downgrade to PHP v7.4 just to double-check if the issue is solved? If necessary, I will request the credentials to the staging site to take a closer look and check the error.
Hi Carlos, you asked to downgrade to PHP to see whether the issue goes away, right?
Yes, it does — the problem exists in PHP 8 but not in PHP 7.4.
You wrote that you’ve advised people to downgrade to PHP 7.4 in the past when they’ve run into this error, which suggests that this is a known bug in WPML’s PHP 8 compatibility, which affects multiple customers.
