https://wiki.php.net/todo/php84

At the time of writing, PHP 8.4 GA is expected late November 2024. The first alpha is expected in July 2024.

• PHP 8.3 tracking issue: PHP 8.3 release tracking #1872
• PHP 8.2 tracking issue: PHP 8.2 release tracking #1802
• PHP 8.1 tracking issue: PHP 8.1 release tracking #1696

I will tool-up the demo server from Alpha 1 onwards.

Working on the basis we will have official support for PHP 8.3 in Textpattern 4.9 and it's unlikely we'll have Textpattern 5 ready by November, I propose we aim to cover any changes needed for PHP 8.4 support in a Textpattern 4.9 patch release.