[PHP] Fix #6770: Debug flag is not passed (#6808)

* Add testcase which reproduces issue #6770

* Pass debug option if needed

* Update samples

* bin/php-petstore.sh
* bin/security/php-petstore.sh

* Api throws exception when failed to open debug file

* Pass debug option if needed (Async)

* Extract instance method

* Update samples

* bin/php-petstore.sh
* bin/security/php-petstore.sh

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

@@ -32,6 +32,7 @@ use GuzzleHttp\ClientInterface;
 use GuzzleHttp\Exception\RequestException;
 use GuzzleHttp\Psr7\MultipartStream;
 use GuzzleHttp\Psr7\Request;
+use GuzzleHttp\RequestOptions;
 use Swagger\Client\ApiException;
 use Swagger\Client\Configuration;
 use Swagger\Client\HeaderSelector;
@@ -113,9 +114,9 @@ class FakeApi
         $request = $this->testCodeInjectEndRnNRRequest($test_code_inject____end____rn_n_r);
 
         try {
-
+            $options = $this->createHttpClientOption();
             try {
-                $response = $this->client->send($request);
+                $response = $this->client->send($request, $options);
             } catch (RequestException $e) {
                 throw new ApiException(
                     "[{$e->getCode()}] {$e->getMessage()}",
@@ -184,7 +185,7 @@ class FakeApi
         $request = $this->testCodeInjectEndRnNRRequest($test_code_inject____end____rn_n_r);
 
         return $this->client
-            ->sendAsync($request)
+            ->sendAsync($request, $this->createHttpClientOption())
             ->then(
                 function ($response) use ($returnType) {
                     return [null, $response->getStatusCode(), $response->getHeaders()];
@@ -294,4 +295,22 @@ class FakeApi
         );
     }
 
+    /**
+     * Create http client option
+     *
+     * @throws \RuntimeException on file opening failure
+     * @return array of http client options
+     */
+    protected function createHttpClientOption()
+    {
+        $options = [];
+        if ($this->config->getDebug()) {
+            $options[RequestOptions::DEBUG] = fopen($this->config->getDebugFile(), 'a');
+            if (!$options[RequestOptions::DEBUG]) {
+                throw new \RuntimeException('Failed to open the debug file: ' . $this->config->getDebugFile());
+            }
+        }
+
+        return $options;
+    }
 }