Minimum PHP 7.4

[phil-davis]

This makes PHP 7.4 the minimum version of PHP.

I am doing this first in sabre-io/uri because it is at the bottom of the dependency tree, so it can happen first, and then other sabre-io repos can make use of it as they do similar.

Note: I don't see any real code changes that would cause any sort of incompatibility for current consumers of major v2 of this repo. I have only had to touch tool configs, parameter types in test code, and setting "public const" in 1 place. I don't think that any of that will be visible/noticeable to real consumers of this code. So probably we do not need to bump the major version in this repo. The "real" code is in lib/functions.php and that already has parameter and return types declared, and it is not a class, so there are no class variables etc to add type declarations...

Just a bump from 2.2.3 to 2.3.0 should be fine.

composer will be smart enough to only select 2.3.0 for projects that have min PHP 7.4 specified. On projects that still support PHP 7.1 7.2 or 7.3, composer will only offer/install release 2.2.3.

Note: in other repos that have more "real" code that needs touching, we will likely need to bump the major version.

[codecov]

Codecov Report

Merging #74 (01e0b60) into master (cd2476f) will decrease coverage by 0.74%.
The diff coverage is 50.00%.

❗ Current head 01e0b60 differs from pull request most recent head bdc592c. Consider uploading reports for the commit bdc592c to get more accurate results

@@             Coverage Diff             @@
##            master      #74      +/-   ##
===========================================
- Coverage   100.00%   99.25%   -0.75%     
===========================================
  Files            1        1              
  Lines          143      135       -8     
===========================================
- Hits           143      134       -9     
- Misses           0        1       +1     

Impacted Files	Coverage Δ
lib/functions.php	99.25% <50.00%> (-0.75%)	⬇️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[phil-davis]

Note: this keeps phpstan happy, otherwise it gets worried that preg_replace_callback might return null and that would cause trouble in later code that uses $uri. I couldn't find a value for the input parameter $uri that will actually cause null - I have to pass in a string (otherwise PHP will get an error on the call itself). So this seems untestable. And thus we get the Codecov warning.

[phil-davis]

This change should not cause any backward-compatibility problem for any consumer that is running at least PHP 7.4. The name and value of the constant is available to consumers just like before.

[phil-davis]

@staabm does this look OK to you?

I think that we can do this repo without bumping the major version.

[staabm]

append([__FILE__])