[PHP] getContents returns empty string after middleware

Hi!
I use swagger-codegen version 2.4.25 for PHP client.

When I use client with logger middleware getContents returns empty string.
And I know why. Because method getContents returns the remaining contents in a string.
If you use logger pointer set to end of body. And getContents returns empty string.

instead of $content = $responseBody->getContents(); you need to $content = $responseBody->__toString();

https://github.com/swagger-api/swagger-codegen/blob/216a4529b51547b328ba722399575f54fb7bfa8a/modules/swagger-codegen/src/main/resources/php/api.mustache#L163

Start with modules/swagger-codegen/src/main/resources/php/api.mustache at the response-body handling around line 163. Reproduce the generated PHP client's behavior with logger middleware, then verify that response content is still returned after the middleware has read the body. Done means the generated client no longer returns an empty string in that case.