[PHP-Lumen] Lumen 5.6 support

[wing328]

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
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Description of the PR

Cherry-picking #114

Credits: @Lv-Yi

I'll update the samples tomorrow and do some tests.

[jimschubert]

I've added WIP label

[ackintosh]

I'll review this PR later today. 👀

[ackintosh]

Ran the sample locally and saw a following error:

$ php artisan serve

In web.php line 77:

  syntax error, unexpected '*', expecting end of file

web.php line 77 -> https://github.com/OpenAPITools/openapi-generator/pull/212/files#diff-e19e515da10035a7c599677e0774c708R77

It caused by Output-Formats: [*/*] in doc comment as */ means end of comment. 🤔

[ackintosh]

The error occurs also in latest master.

git:(master*) $ php -l samples/server/petstore/php-lumen/lib/app/Http/routes.php

Parse error: syntax error, unexpected '*', expecting end of file in samples/server/petstore/php-lumen/lib/app/Http/routes.php on line 77
Errors parsing samples/server/petstore/php-lumen/lib/app/Http/routes.php

[wing328]

@ackintosh thanks for testing it.

I would suggest a quick fix by removing that line for the time being to make the output functional first and then we'll deal with it later with escaping or other approaches.

[ackintosh]

@wing328 Totally agree with you. I'll work for the quick fix on master branch later.

[wing328]

@ackintosh I've just removed Output-Format from route.mustache and update the samples. Please pull the latest and run another test to see if the output looks good from your perspective.

[ackintosh]

@wing328 I've added some commits and now the samples seems work fine.

[ackintosh]

I've changed the base branch as this PR includes breaking changes.

[Lv-Yi]

just fyi. in pr#343 I'm trying to add back output format by skip * / injection.