Currently there is 7.4 to be released in few days. I used to use “nightly” but it’s now PHP8.
Generally for libraries, it would be useful to have an option to test with (as per https://www.php.net/supported-versions.php as of 2019-11-15):
Motivation for this is that I want to make sure the library works on those versions all the time. And it’s a lot of useless work to update the list every time PHP version is released.
What do you think?