diff --git a/modules/swagger-codegen/src/main/resources/php/ApiException.mustache b/modules/swagger-codegen/src/main/resources/php/ApiException.mustache
index 3df0f467fc02..31dc76fe3fbc 100644
--- a/modules/swagger-codegen/src/main/resources/php/ApiException.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/ApiException.mustache
@@ -55,12 +55,12 @@ class ApiException extends Exception
     /**
      * Constructor
      *
-     * @param string $message         Error message
-     * @param int    $code            HTTP status code
-     * @param string $responseHeaders HTTP response header
-     * @param mixed  $responseBody    HTTP body of the server response either as Json or string
+     * @param string   $message         Error message
+     * @param int      $code            HTTP status code
+     * @param string[] $responseHeaders HTTP response header
+     * @param mixed    $responseBody    HTTP decoded body of the server response either as \stdClass or string
      */
-    public function __construct($message = "", $code = 0, $responseHeaders = null, $responseBody = null)
+    public function __construct($message = "", $code = 0, $responseHeaders = [], $responseBody = null)
     {
         parent::__construct($message, $code);
         $this->responseHeaders = $responseHeaders;
@@ -70,7 +70,7 @@ class ApiException extends Exception
     /**
      * Gets the HTTP response header
      *
-     * @return string HTTP response header
+     * @return string[] HTTP response headers
      */
     public function getResponseHeaders()
     {
@@ -80,7 +80,7 @@ class ApiException extends Exception
     /**
      * Gets the HTTP body of the server response either as Json or string
      *
-     * @return mixed HTTP body of the server response either as Json or string
+     * @return mixed HTTP body of the server response either as \stdClass or string
      */
     public function getResponseBody()
     {
diff --git a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ApiException.php b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ApiException.php
index 4c029f982aef..6bc8c02024d9 100644
--- a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ApiException.php
+++ b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ApiException.php
@@ -65,12 +65,12 @@ class ApiException extends Exception
     /**
      * Constructor
      *
-     * @param string $message         Error message
-     * @param int    $code            HTTP status code
-     * @param string $responseHeaders HTTP response header
-     * @param mixed  $responseBody    HTTP body of the server response either as Json or string
+     * @param string   $message         Error message
+     * @param int      $code            HTTP status code
+     * @param string[] $responseHeaders HTTP response header
+     * @param mixed    $responseBody    HTTP decoded body of the server response either as \stdClass or string
      */
-    public function __construct($message = "", $code = 0, $responseHeaders = null, $responseBody = null)
+    public function __construct($message = "", $code = 0, $responseHeaders = [], $responseBody = null)
     {
         parent::__construct($message, $code);
         $this->responseHeaders = $responseHeaders;
@@ -80,7 +80,7 @@ class ApiException extends Exception
     /**
      * Gets the HTTP response header
      *
-     * @return string HTTP response header
+     * @return string[] HTTP response headers
      */
     public function getResponseHeaders()
     {
@@ -90,7 +90,7 @@ class ApiException extends Exception
     /**
      * Gets the HTTP body of the server response either as Json or string
      *
-     * @return mixed HTTP body of the server response either as Json or string
+     * @return mixed HTTP body of the server response either as \stdClass or string
      */
     public function getResponseBody()
     {
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/ApiException.php b/samples/client/petstore/php/SwaggerClient-php/lib/ApiException.php
index 8fa9056dbabb..2c1a040490b5 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/ApiException.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/ApiException.php
@@ -65,12 +65,12 @@ class ApiException extends Exception
     /**
      * Constructor
      *
-     * @param string $message         Error message
-     * @param int    $code            HTTP status code
-     * @param string $responseHeaders HTTP response header
-     * @param mixed  $responseBody    HTTP body of the server response either as Json or string
+     * @param string   $message         Error message
+     * @param int      $code            HTTP status code
+     * @param string[] $responseHeaders HTTP response header
+     * @param mixed    $responseBody    HTTP decoded body of the server response either as \stdClass or string
      */
-    public function __construct($message = "", $code = 0, $responseHeaders = null, $responseBody = null)
+    public function __construct($message = "", $code = 0, $responseHeaders = [], $responseBody = null)
     {
         parent::__construct($message, $code);
         $this->responseHeaders = $responseHeaders;
@@ -80,7 +80,7 @@ class ApiException extends Exception
     /**
      * Gets the HTTP response header
      *
-     * @return string HTTP response header
+     * @return string[] HTTP response headers
      */
     public function getResponseHeaders()
     {
@@ -90,7 +90,7 @@ class ApiException extends Exception
     /**
      * Gets the HTTP body of the server response either as Json or string
      *
-     * @return mixed HTTP body of the server response either as Json or string
+     * @return mixed HTTP body of the server response either as \stdClass or string
      */
     public function getResponseBody()
     {
diff --git a/samples/client/petstore/php/test.php b/samples/client/petstore/php/test.php
index 6f571a1c1769..5c27e3d7ae99 100644
--- a/samples/client/petstore/php/test.php
+++ b/samples/client/petstore/php/test.php
@@ -55,7 +55,7 @@ try {
 
 } catch (Swagger\Client\ApiException $e) {
     echo 'Caught exception: ', $e->getMessage(), "\n";
-    echo 'HTTP response headers: ', $e->getResponseHeaders(), "\n";
-    echo 'HTTP response body: ', $e->getResponseBody(), "\n";
+    echo 'HTTP response headers: ', print_r($e->getResponseHeaders(), true), "\n";
+    echo 'HTTP response body: ', print_r($e->getResponseBody(), true), "\n";
     echo 'HTTP status code: ', $e->getCode(), "\n";
 }