[PHP] fixed ApiException's methods return types

[baartosz]

PR checklist

• Read the contribution guildelines.
• Ran the shell/batch 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)
• Filed the PR against the correct branch: master for non-breaking changes and 2.3.0 branch for breaking (non-backward compatible) changes.

Description of the PR

Hi. This PR fixes minor errors in test.php file which where caused by different types returned than expected. Preview:

/usr/bin/php /home/bbialek/projects/swagger-codegen/samples/client/petstore/php/test.php
PHP SDK (Swagger\Client) Debug Report:
    OS: Linux bbialek-HP-EliteDesk-800-G1-SFF 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64
    PHP Version: 7.0.13-0ubuntu0.16.04.1
    OpenAPI Spec Version: 1.0.0
    Temp Folder Path: /tmp
PHP Notice:  Array to string conversion in /home/bbialek/projects/swagger-codegen/samples/client/petstore/php/test.php on line 58
PHP Stack trace:
PHP   1. {main}() /home/bbialek/projects/swagger-codegen/samples/client/petstore/php/test.php:0
PHP Catchable fatal error:  Object of class stdClass could not be converted to string in /home/bbialek/projects/swagger-codegen/samples/client/petstore/php/test.php on line 59
PHP Stack trace:
PHP   1. {main}() /home/bbialek/projects/swagger-codegen/samples/client/petstore/php/test.php:0
Caught exception: [404] Error connecting to the API (http://petstore.swagger.io/v2/pet/10005)
HTTP response headers: Array
HTTP response body: 
Process finished with exit code 255

After fix:

/usr/bin/php /home/bbialek/projects/swagger-codegen/samples/client/petstore/php/test.php
PHP SDK (Swagger\Client) Debug Report:
    OS: Linux bbialek-HP-EliteDesk-800-G1-SFF 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64
    PHP Version: 7.0.13-0ubuntu0.16.04.1
    OpenAPI Spec Version: 1.0.0
    Temp Folder Path: /tmp
Caught exception: [404] Error connecting to the API (http://petstore.swagger.io/v2/pet/10005)
HTTP response headers: Array
(
    [0] => HTTP/1.1 404 Not Found
    [Date] => Thu, 23 Feb 2017 09:38:59 GMT
    [Access-Control-Allow-Origin] => *
    [Access-Control-Allow-Methods] => GET, POST, DELETE, PUT
    [Access-Control-Allow-Headers] => Content-Type, api_key, Authorization
    [Content-Type] => application/json
    [Connection] => close
    [Server] => Jetty(9.2.9.v20150224)
)

HTTP response body: stdClass Object
(
    [code] => 1
    [type] => error
    [message] => Pet not found
)

HTTP status code: 404

Process finished with exit code 0

I also updated return types in ApiException template to match what is really passed there in generated ApiClient class: https://github.com/swagger-api/swagger-codegen/blob/master/samples/client/petstore/php/SwaggerClient-php/lib/ApiClient.php#L283

[wing328]

Thanks for the PR but your commit (as shown in the Commits tab) is not linked to your Github account, which means this PR won't count as your contribution in https://github.com/swagger-api/swagger-codegen/graphs/contributors.

Let me know if you need help fixing it.

Ref: https://github.com/swagger-api/swagger-codegen/wiki/FAQ#how-can-i-update-commits-that-are-not-linked-to-my-github-account

[arnested]

LGTM 👍

[wing328]

@arnested thanks for reviewing the change.

@baartosz thanks for your contribution, which has been merged into master (2.2.3)