[PHP] Fix InvalidArgumentException

modules/swagger-codegen/src/main/resources/php/api.mustache

@@ -417,8 +417,12 @@ use {{invokerPackage}}\ObjectSerializer;
 
         // for model (json/xml)
         if (isset($_tempBody)) {
-            $httpBody = $_tempBody; // $_tempBody is the method argument, if present
-
+            // $_tempBody is the method argument, if present
+            $httpBody = $_tempBody;
+            // \stdClass has no __toString(), so we should encode it manually
+            if ($httpBody instanceof \stdClass && $headers['Content-Type'] === 'application/json') {
+                $httpBody = \GuzzleHttp\json_encode($httpBody);
+            }
         } elseif (count($formParams) > 0) {
             if ($multipart) {
                 $multipartContents = [];

modules/swagger-codegen/src/test/resources/2_0/petstore-with-fake-endpoints-models-for-testing.yaml

@@ -898,6 +898,27 @@ paths:
       responses:
         '200':
           description: successful operation
+  /fake/inline-additionalProperties:
+    post:
+      tags:
+        - fake
+      summary: test inline additionalProperties
+      description: ''
+      operationId: testInlineAdditionalProperties
+      consumes:
+        - application/json
+      parameters:
+        - name: param
+          in: body
+          description: request body
+          required: true
+          schema:
+            type: object
+            additionalProperties:
+              type: string
+      responses:
+        '200':
+          description: successful operation
   /another-fake/dummy:
     patch:
       tags:

samples/client/petstore-security-test/php/SwaggerClient-php/lib/Api/FakeApi.php

@@ -246,8 +246,12 @@ protected function testCodeInjectEndRnNRRequest($test_code_inject____end____rn_n
 
         // for model (json/xml)
         if (isset($_tempBody)) {
-            $httpBody = $_tempBody; // $_tempBody is the method argument, if present
-
+            // $_tempBody is the method argument, if present
+            $httpBody = $_tempBody;
+            // \stdClass has no __toString(), so we should encode it manually
+            if ($httpBody instanceof \stdClass && $headers['Content-Type'] === 'application/json') {
+                $httpBody = \GuzzleHttp\json_encode($httpBody);
+            }
         } elseif (count($formParams) > 0) {
             if ($multipart) {
                 $multipartContents = [];

samples/client/petstore/php/SwaggerClient-php/README.md

@@ -83,6 +83,7 @@ Class | Method | HTTP request | Description
 *FakeApi* | [**testClientModel**](docs/Api/FakeApi.md#testclientmodel) | **PATCH** /fake | To test \"client\" model
 *FakeApi* | [**testEndpointParameters**](docs/Api/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
 *FakeApi* | [**testEnumParameters**](docs/Api/FakeApi.md#testenumparameters) | **GET** /fake | To test enum parameters
+*FakeApi* | [**testInlineAdditionalProperties**](docs/Api/FakeApi.md#testinlineadditionalproperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 *FakeApi* | [**testJsonFormData**](docs/Api/FakeApi.md#testjsonformdata) | **GET** /fake/jsonFormData | test json serialization of form data
 *FakeClassnameTags123Api* | [**testClassname**](docs/Api/FakeClassnameTags123Api.md#testclassname) | **PATCH** /fake_classname_test | To test class name in snake case
 *PetApi* | [**addPet**](docs/Api/PetApi.md#addpet) | **POST** /pet | Add a new pet to the store

samples/client/petstore/php/SwaggerClient-php/docs/Api/FakeApi.md

@@ -11,6 +11,7 @@ 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
+[**testInlineAdditionalProperties**](FakeApi.md#testInlineAdditionalProperties) | **POST** /fake/inline-additionalProperties | test inline additionalProperties
 [**testJsonFormData**](FakeApi.md#testJsonFormData) | **GET** /fake/jsonFormData | test json serialization of form data
 
 
@@ -371,6 +372,50 @@ No authorization required
 
 [[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
 
+# **testInlineAdditionalProperties**
+> testInlineAdditionalProperties($param)
+
+test inline additionalProperties
+
+
+
+### Example
+```php
+<?php
+require_once(__DIR__ . '/vendor/autoload.php');
+
+$api_instance = new Swagger\Client\Api\FakeApi(new \Http\Adapter\Guzzle6\Client());
+$param = new \stdClass; // object | request body
+
+try {
+    $api_instance->testInlineAdditionalProperties($param);
+} catch (Exception $e) {
+    echo 'Exception when calling FakeApi->testInlineAdditionalProperties: ', $e->getMessage(), PHP_EOL;
+}
+?>
+```
+
+### Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **param** | **object**| request body |
+
+### Return type
+
+void (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: application/json
+ - **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../../README.md#documentation-for-api-endpoints) [[Back to Model list]](../../README.md#documentation-for-models) [[Back to README]](../../README.md)
+
 # **testJsonFormData**
 > testJsonFormData($param, $param2)
 

samples/client/petstore/php/SwaggerClient-php/lib/Api/AnotherFakeApi.php

@@ -288,8 +288,12 @@ protected function testSpecialTagsRequest($body)
 
         // for model (json/xml)
         if (isset($_tempBody)) {
-            $httpBody = $_tempBody; // $_tempBody is the method argument, if present
-
+            // $_tempBody is the method argument, if present
+            $httpBody = $_tempBody;
+            // \stdClass has no __toString(), so we should encode it manually
+            if ($httpBody instanceof \stdClass && $headers['Content-Type'] === 'application/json') {
+                $httpBody = \GuzzleHttp\json_encode($httpBody);
+            }
         } elseif (count($formParams) > 0) {
             if ($multipart) {
                 $multipartContents = [];