I have installed APCu without any issues on PHP 8. It has compatibility up to 8.1, 8.2, and partial on PHP 8.3.
PHP 7.4 has been end of life for a while and no longer receives security updates. I would highly recommend looking into upgrading to PHP 8.1. I haven’t run into any major issues with upgrading to 8.1 with WordPress. I suppose there might be some third party plugins that may not have been updated to be compatible with PHP 8… but it might be wise to replace them.
https://pecl.php.net/package/APCu
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This reply was modified 6 months, 3 weeks ago by sbirley.