[PHP] A php-analyzer

[homersimpsons]

I would like to create an analyzer for PHP.

I already created https://github.com/exercism/php-representer.

I did initiate the work in https://github.com/homersimpsons/php-analyzer and would happily include it in the exercism organization.

While tagging the solutions for the training set at exercism/php#573 I eventually figured out that it may be faster to write the analyzer (that I already started).

I now have a working prototype that can tag construct:if on solutions. Of course there is still work to do:

• CI
• Tests
• Implements all tags
• Start implementing some comments

I did read the doc carefully, and I have some more questions:

• In https://exercism.org/docs/building/tooling/analyzers/interface there is the following message:

  All interactions with the Exercism website are handled automatically. Analyzers have the single responsibility of taking a solution and returning a status and any messages

  I could not seem to find where is this "status" documented.

• In https://exercism.org/docs/building/tooling/analyzers/interface there is the following message:

  When using parameterized files, ensure to escape all uses of % by placing anther % in front of it. e.g. Try aim for 100%% of the tests passing.

  Does this apply to params value ?

• The doc https://exercism.org/docs/building/tooling/analyzers/interface mention the time constraints, but memory constraints are rather vague. Do you know the default memory constraints ? For small files PHPStan's consumes 100Mb of memory but this won't get too high, can I put a limit of 512Mb ? Should it be lower ? (I read that it is possible to customize it but I would rather have it as low as possible for now)

• I had some questions about some tags in Building a training set of tags for php php#573 (comment) too

(I did not start from https://github.com/exercism/generic-analyzer but this won't be too hard for me to update the code to this template)