feat: add support for parsing array options

[paulbalandan]

Description
Support parsing --option=foo --option=bar into ['option' => ['foo', 'bar']].

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[michalsn]

The array options feature makes sense, but I'm worried about changing getOption() to sometimes return an array. Existing commands treat it as a scalar/flag accessor.

What do you think about keeping getOption() returning a single value, with a defined rule like "last value wins", and adding a separate method to retrieve all values for repeated options?

That would keep existing code safe while still supporting the new feature.

[neznaika0]

@michalsn, Illogical. Relying on the last key has no order. The array seems like a sure change. We have already created BC, so compatibility will be broken.

In this case, for major changes, you already need to have a branch of ~10.x, as many major fixes have been made. Alternatively, you should update the contribution rules and specify that the minor branch may contain new features and BC.

Has phpstan got new rules? A lot of mistakes

[michalsn]

@neznaika0

Illogical. Relying on the last key has no order.

CLI arguments absolutely have order. --foo=a --foo=b is an ordered sequence, and "last wins" is a very common rule in CLI parsing.

The array seems like a sure change.

My main concern is that changing getOption() to sometimes return an array is risky for existing commands because repeated options could hit unhandled cases and break things. See:
https://github.com/codeigniter4/CodeIgniter4/blob/develop/system/Commands/Server/Serve.php#L94

But as always, I'm not gonna be stubborn. If the majority is okay with this, let's proceed.

Has phpstan got new rules? A lot of mistakes

Yes, I haven't had time to investigate, maybe on the weekend.

[neznaika0]

I understand what you're talking about. In such cases, yes, the latter value looks acceptable.

About the order. I mean, if we select the last value, will the ./run-script --php=off --php=8.5 --php=8.2 call be different ./run-script --php=8.2 --php=8.5 --php=off ?

[michalsn]

Yes, in the first case you end up with 8.2, in the second the value is off.

This is natural: each occurrence overwrites the previous one. If the command isn't meant to handle arrays, getOption() is fine and won't break anything.

If we want repeated parameters, getOptionValues() (or similar method) can always return an array regardless of how many times the flag appears. This makes it easier to work with and ensures consistent behavior whether the option is passed once or multiple times.