PHP 8.0 support

[joseluisq]

This PR adds PHP 8.0 support.
It was tested successfully with PHP 8.0 via Docker.

docker run --rm -it -v $PWD:/var/www/html joseluisq/php-fpm:8.0 \
  sh -c 'composer install && vendor/bin/phpunit'

Note: PHP 8.1 support could come later via a new PR.

[joseluisq]

@ssheduardo here is the initial draft PR for adding PHP 8.0. It works in general with just a minor fix on the tests.
But it is necessary to bump up to 7.4 as the minimum PHP version required via composer.json.

PHP 8.1 will give more test problems but they can be solved in a second PR.

[ssheduardo]

Hola, tienes algún correo u otro medio para comunicarme contigo?

[ssheduardo]

Hi,
When run the command:

docker run --rm -it -v $PWD:/var/www/html joseluisq/php-fpm:8.0 \
  bash -c 'composer install && vendor/bin/phpunit'

The docker response:

But if I change bash to sh, the command no show the error.

Run test is OK

[joseluisq]

Hola, tienes algún correo u otro medio para comunicarme contigo?

Puede usar mi cuenta Keybase para chat directo. https://joseluisq.net my usuario es joseluisq

[joseluisq]

But if I change bash to sh, the command no show the error.

Yes, fixed in the description.