Support PHP 8

[canvural]

Hi,

PHP 8 will be released at the end of this month. It'd be cool if we can add support for it.

I began to investigate what needs to be done to support PHP 8. Most packages we depend on have releases that support PHP 8. Here are the non-compatible packages and issues I found:

• https://github.com/cebe/php-openapi currently does not have support. I created there Support PHP 8 cebe/php-openapi#81 to track the progress.

• https://github.com/dflydev/dflydev-fig-cookies I created PHP8 Support dflydev/dflydev-fig-cookies#38 and PHP 8 Support dflydev/dflydev-fig-cookies#39 . Waiting for response. But don't have much hope. Can we find an alternative?

• https://github.com/php-cache/array-adapter does not support PHP 8. I'm not sure they are open to new PRs. Looks like it didn't receive any maintenance over the last 2 years. Symfony's solution can be used instead.

That's all I guess. What do you think?

[scaytrase]

php-cache looks abandoned indeed. sf cache is ok

[scaytrase]

dflydev-fig-cookies looks not very healthy too. I think it's OK to at least research and suggest some replacements.

[simensen]

My bad for not seeing the PR opened on dflydev/dflydev-fig-cookies. It's definitely still a viable project and has little to no activity because it covers most everything pretty well.

<3 for your usage of this library in the past and my bad for not getting back to your feedback/PR earlier.