[BUG] [PHP] no data in container due to `$responseBody->getContents()`

Created by: cjprinse

Bug Report Checklist

• ☑ Have you provided a full/minimal spec to reproduce the issue?
• ☑ Have you validated the input using an OpenAPI validator (example)?
• ☑ What's the version of OpenAPI Generator used?
• ☑ Have you search for related issues/PRs?
• ☑ What's the actual output vs expected output?

Description

The method GuzzleHttp\Psr7\Stream::getContents will not reset the stream to position 0. So, when u are using middleware to intercept the response (eg guzzle profiler), getContents will return a empty value. As a consequence the data in the model container will be empty.pty.

openapi-generator version

v4.2.1

OpenAPI declaration file content or url

https://gist.github.com/cjprinse/4c5b5e2f5065fc3c24f0829c7448e640

Command line used for generation

npx openapi-generator generate -g php -o bundles/src/Etrias/Bundles/WarehouseBundle/Connector -i ~/swagger.json --skip-validate-spec --invoker-package=Etrias\\\\Bundles\\\\WarehouseBundle\\\\Connector\\\\lib

Suggest a fix

Use GuzzleHttp\Psr7\Stream::__toString instead of GuzzleHttp\Psr7\Stream::getContents()