Allow installation of PHP 8

[localheinz]

Is your feature request related to a problem? Please describe.

It would be nice to be able to install PHP 8 (https://github.com/php/php-src/tree/master).

Describe the solution you'd like

Add version alias master or similar, which allowed installing PHP 8 (https://github.com/php/php-src/tree/master).

Describe alternatives you've considered

n/a

Additional context

n/a

[shivammathur]

Working on this currently.
https://github.com/shivammathur/setup-php/projects/1#card-29611356

[shivammathur]

@localheinz

uses: shivammathur/setup-php@v1
with:
  php-version: '8.0'

This will now setup a nightly build PHP 8.0.0-dev from the master branch of php/php-src on ubuntu and macOS.
The build has JIT compiler enabled with the following configuration. You can use ini-values input to change these values. Refer to this RFC for details - https://wiki.php.net/rfc/jit

opcache.jit_buffer_size = 256M
opcache.jit = 1235
pcre.jit = 1

[localheinz]

@shivammathur

Awesome, thank you!

[sebastianbergmann]

@shivammathur Thank you! We (and by that I mean @localheinz) we use this ASAP for PHPUnit's CI pipeline(s).

[localheinz]

@shivammathur

Sorry to bother you, but we've just tried it out in sebastianbergmann/phpunit#3979: looks like PHP 7.3.12 is used:

• https://github.com/sebastianbergmann/phpunit/pull/3979/checks?check_run_id=339672157#step:3:12
• https://github.com/sebastianbergmann/phpunit/pull/3979/checks?check_run_id=339672157#step:8:6

Are we doing it wrong, or are we too early?

[shivammathur]

@localheinz
Please quote these versions as GitHub Actions truncates zeros after decimal in inputs.

php-version:
  - '7.3'
  - '7.4'
  - '8.0'