Add group parameter support to PHP client (#1337)

* add group parameter support to php template

* more update for group parameter

* fix call to protect function

* fix missing $

* update based on feedback

* create fake endpoint to test group parameters

* sync fake petstore spec v2, v3

* fix php doc for group parameters

* update petstore samples

* update fake petstore spec v2

* update petstore samples

* fix spec and update samples

samples/client/petstore/java/jersey2-java8/docs/FakeApi.md

@@ -13,6 +13,7 @@ Method | HTTP request | Description
 [**testClientModel**](FakeApi.md#testClientModel) | **PATCH** /fake | To test \"client\" model
 [**testEndpointParameters**](FakeApi.md#testEndpointParameters) | **POST** /fake | Fake endpoint for testing various parameters 假端點 偽のエンドポイント 가짜 엔드 포인트 
 [**testEnumParameters**](FakeApi.md#testEnumParameters) | **GET** /fake | To test enum parameters
+[**testGroupParameters**](FakeApi.md#testGroupParameters) | **DELETE** /fake | Fake endpoint to test group parameters (optional)
 [**testInlineAdditionalProperties**](FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 [**testJsonFormData**](FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
 
@@ -467,6 +468,54 @@ No authorization required
  - **Content-Type**: application/x-www-form-urlencoded
  - **Accept**: Not defined
 
+<a name="testGroupParameters"></a>
+# **testGroupParameters**
+> testGroupParameters(stringGroup, booleanGroup, int64Group)
+
+Fake endpoint to test group parameters (optional)
+
+Fake endpoint to test group parameters (optional)
+
+### Example
+```java
+// Import classes:
+//import org.openapitools.client.ApiException;
+//import org.openapitools.client.api.FakeApi;
+
+
+FakeApi apiInstance = new FakeApi();
+Integer stringGroup = 56; // Integer | String in group parameters
+Boolean booleanGroup = true; // Boolean | Boolean in group parameters
+Long int64Group = 56L; // Long | Integer in group parameters
+try {
+    apiInstance.testGroupParameters(stringGroup, booleanGroup, int64Group);
+} catch (ApiException e) {
+    System.err.println("Exception when calling FakeApi#testGroupParameters");
+    e.printStackTrace();
+}
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **stringGroup** | **Integer**| String in group parameters | [optional]
+ **booleanGroup** | **Boolean**| Boolean in group parameters | [optional]
+ **int64Group** | **Long**| Integer in group parameters | [optional]
+
+### Return type
+
+null (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: Not defined
+ - **Accept**: Not defined
+
 <a name="testInlineAdditionalProperties"></a>
 # **testInlineAdditionalProperties**
 > testInlineAdditionalProperties(requestBody)