diff --git a/modules/swagger-codegen/src/main/resources/php/ObjectSerializer.mustache b/modules/swagger-codegen/src/main/resources/php/ObjectSerializer.mustache
index 64cf90a72ca..0f5de349aca 100644
--- a/modules/swagger-codegen/src/main/resources/php/ObjectSerializer.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/ObjectSerializer.mustache
@@ -32,16 +32,18 @@ class ObjectSerializer
     /**
      * Serialize data
      *
-     * @param mixed $data the data to serialize
+     * @param mixed  $data   the data to serialize
+     * @param string $type   the SwaggerType of the data
+     * @param string $format the format of the Swagger type of the data
      *
      * @return string|object serialized form of $data
      */
-    public static function sanitizeForSerialization($data)
+    public static function sanitizeForSerialization($data, $type = null, $format = null)
     {
         if (is_scalar($data) || null === $data) {
             return $data;
         } elseif ($data instanceof \DateTime) {
-            return $data->format(\DateTime::ATOM);
+            return ($format === 'date') ? $data->format('Y-m-d') : $data->format(\DateTime::ATOM);
         } elseif (is_array($data)) {
             foreach ($data as $property => $value) {
                 $data[$property] = self::sanitizeForSerialization($value);
@@ -49,6 +51,7 @@ class ObjectSerializer
             return $data;
         } elseif (is_object($data)) {
             $values = [];
+            $formats = $data::swaggerFormats();
             foreach ($data::swaggerTypes() as $property => $swaggerType) {
                 $getter = $data::getters()[$property];
                 $value = $data->$getter();
@@ -58,7 +61,7 @@ class ObjectSerializer
                     throw new \InvalidArgumentException("Invalid value for enum '$swaggerType', must be one of: '$imploded'");
                 }
                 if ($value !== null) {
-                    $values[$data::attributeMap()[$property]] = self::sanitizeForSerialization($value);
+                    $values[$data::attributeMap()[$property]] = self::sanitizeForSerialization($value, $swaggerType, $formats[$property]);
                 }
             }
             return (object)$values;
diff --git a/modules/swagger-codegen/src/main/resources/php/api.mustache b/modules/swagger-codegen/src/main/resources/php/api.mustache
index dfde3fc3b5b..1efbe254d8f 100644
--- a/modules/swagger-codegen/src/main/resources/php/api.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/api.mustache
@@ -80,8 +80,10 @@ use \{{invokerPackage}}\ObjectSerializer;
 
     /**
      * Operation {{{operationId}}}
+{{#summary}}
      *
      * {{{summary}}}
+{{/summary}}
      *
 {{#description}}
      * {{.}}
@@ -101,8 +103,10 @@ use \{{invokerPackage}}\ObjectSerializer;
 
     /**
      * Operation {{{operationId}}}WithHttpInfo
+{{#summary}}
      *
      * {{{summary}}}
+{{/summary}}
      *
 {{#description}}
      * {{.}}
diff --git a/modules/swagger-codegen/src/main/resources/php/api_test.mustache b/modules/swagger-codegen/src/main/resources/php/api_test.mustache
index c6504437012..adf6455ef9b 100644
--- a/modules/swagger-codegen/src/main/resources/php/api_test.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/api_test.mustache
@@ -39,7 +39,6 @@ use \{{invokerPackage}}\ObjectSerializer;
      */
     public static function setUpBeforeClass()
     {
-
     }
 
     /**
@@ -47,7 +46,6 @@ use \{{invokerPackage}}\ObjectSerializer;
      */
     public function setUp()
     {
-
     }
 
     /**
@@ -55,7 +53,6 @@ use \{{invokerPackage}}\ObjectSerializer;
      */
     public function tearDown()
     {
-
     }
 
     /**
@@ -63,10 +60,9 @@ use \{{invokerPackage}}\ObjectSerializer;
      */
     public static function tearDownAfterClass()
     {
-
     }
-
     {{#operation}}
+
     /**
      * Test case for {{{operationId}}}
      *
@@ -75,9 +71,7 @@ use \{{invokerPackage}}\ObjectSerializer;
      */
     public function test{{vendorExtensions.x-testOperationId}}()
     {
-
     }
-
     {{/operation}}
 }
 {{/operations}}
diff --git a/modules/swagger-codegen/src/main/resources/php/model_enum.mustache b/modules/swagger-codegen/src/main/resources/php/model_enum.mustache
index c34cfb3faac..5e6b2aea215 100644
--- a/modules/swagger-codegen/src/main/resources/php/model_enum.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/model_enum.mustache
@@ -1,4 +1,5 @@
-class {{classname}} {
+class {{classname}}
+{
     /**
      * Possible values of this enum
      */
diff --git a/modules/swagger-codegen/src/main/resources/php/model_generic.mustache b/modules/swagger-codegen/src/main/resources/php/model_generic.mustache
index 83cf38deb46..611cdcb013f 100644
--- a/modules/swagger-codegen/src/main/resources/php/model_generic.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/model_generic.mustache
@@ -17,11 +17,25 @@ class {{classname}} {{#parentSchema}}extends {{{parent}}} {{/parentSchema}}imple
         {{/hasMore}}{{/vars}}
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        {{#vars}}'{{name}}' => {{#dataFormat}}'{{{dataFormat}}}'{{/dataFormat}}{{^dataFormat}}null{{/dataFormat}}{{#hasMore}},
+        {{/hasMore}}{{/vars}}
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes{{#parentSchema}} + parent::swaggerTypes(){{/parentSchema}};
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats{{#parentSchema}} + parent::swaggerFormats(){{/parentSchema}};
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/modules/swagger-codegen/src/main/resources/php/model_test.mustache b/modules/swagger-codegen/src/main/resources/php/model_test.mustache
index 396a3eccb7a..363be167fcb 100644
--- a/modules/swagger-codegen/src/main/resources/php/model_test.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/model_test.mustache
@@ -39,7 +39,6 @@ class {{classname}}Test extends \PHPUnit_Framework_TestCase
      */
     public static function setUpBeforeClass()
     {
-
     }
 
     /**
@@ -47,7 +46,6 @@ class {{classname}}Test extends \PHPUnit_Framework_TestCase
      */
     public function setUp()
     {
-
     }
 
     /**
@@ -55,7 +53,6 @@ class {{classname}}Test extends \PHPUnit_Framework_TestCase
      */
     public function tearDown()
     {
-
     }
 
     /**
@@ -63,7 +60,6 @@ class {{classname}}Test extends \PHPUnit_Framework_TestCase
      */
     public static function tearDownAfterClass()
     {
-
     }
 
     /**
@@ -71,18 +67,15 @@ class {{classname}}Test extends \PHPUnit_Framework_TestCase
      */
     public function test{{classname}}()
     {
-
     }
-
 {{#vars}}
+
     /**
      * Test attribute "{{name}}"
      */
     public function testProperty{{nameInCamelCase}}()
     {
-
     }
-
 {{/vars}}
 }
 {{/model}}
diff --git a/samples/client/petstore-security-test/php/.swagger-codegen/VERSION b/samples/client/petstore-security-test/php/.swagger-codegen/VERSION
new file mode 100644
index 00000000000..7fea99011a6
--- /dev/null
+++ b/samples/client/petstore-security-test/php/.swagger-codegen/VERSION
@@ -0,0 +1 @@
+2.2.3-SNAPSHOT
\ No newline at end of file
diff --git a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Api/FakeApi.php b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Api/FakeApi.php
index 7c6c1e4a8c8..419750c64da 100644
--- a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Api/FakeApi.php
+++ b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Api/FakeApi.php
@@ -129,7 +129,7 @@ class FakeApi
         if ($test_code_inject____end____rn_n_r !== null) {
             $formParams['test code inject */ ' " =end -- \r\n \n \r'] = $this->apiClient->getSerializer()->toFormValue($test_code_inject____end____rn_n_r);
         }
-        
+
         // for model (json/xml)
         if (isset($_tempBody)) {
             $httpBody = $_tempBody; // $_tempBody is the method argument, if present
diff --git a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ApiClient.php b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ApiClient.php
index ea22b4f99ee..6d600a1bf2a 100644
--- a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ApiClient.php
+++ b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ApiClient.php
@@ -167,7 +167,7 @@ class ApiClient
         if ($this->config->getCurlConnectTimeout() != 0) {
             curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, $this->config->getCurlConnectTimeout());
         }
-        
+
         // return the result on success, rather than just true
         curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
 
@@ -199,6 +199,10 @@ class ApiClient
             $url = ($url . '?' . http_build_query($queryParams));
         }
 
+        if ($this->config->getAllowEncoding()) {
+            curl_setopt($curl, CURLOPT_ENCODING, '');
+        }
+
         if ($method === self::$POST) {
             curl_setopt($curl, CURLOPT_POST, true);
             curl_setopt($curl, CURLOPT_POSTFIELDS, $postData);
diff --git a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Configuration.php b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Configuration.php
index 5f19f8df53a..8aad4356eee 100644
--- a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Configuration.php
+++ b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Configuration.php
@@ -177,6 +177,13 @@ class Configuration
      */
     protected $proxyPassword;
 
+    /**
+     * Allow Curl encoding header
+     *
+     * @var bool
+     */
+    protected $allowEncoding = false;
+
     /**
      * Constructor
      */
@@ -445,6 +452,16 @@ class Configuration
         return $this;
     }
 
+    /**
+     * Set whether to accept encoding
+     * @param bool $allowEncoding
+     */
+    public function setAllowEncoding($allowEncoding)
+    {
+        $this->allowEncoding = $allowEncoding;
+        return $this;
+    }
+
     /**
      * Gets the HTTP connect timeout value
      *
@@ -455,6 +472,15 @@ class Configuration
         return $this->curlConnectTimeout;
     }
 
+    /**
+     * Get whether to allow encoding
+     *
+     * @return bool
+     */
+    public function getAllowEncoding()
+    {
+        return $this->allowEncoding;
+    }
 
     /**
      * Sets the HTTP Proxy Host
diff --git a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Model/ModelReturn.php b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Model/ModelReturn.php
index 7f68442329a..e71899f4a49 100644
--- a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Model/ModelReturn.php
+++ b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/Model/ModelReturn.php
@@ -58,11 +58,24 @@ class ModelReturn implements ArrayAccess
         'return' => 'int'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'return' => 'int32'
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ObjectSerializer.php b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ObjectSerializer.php
index 3756fd644be..6e0dbb437be 100644
--- a/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ObjectSerializer.php
+++ b/samples/client/petstore-security-test/php/SwaggerClient-php/lib/ObjectSerializer.php
@@ -42,16 +42,18 @@ class ObjectSerializer
     /**
      * Serialize data
      *
-     * @param mixed $data the data to serialize
+     * @param mixed  $data   the data to serialize
+     * @param string $type   the SwaggerType of the data
+     * @param string $format the format of the Swagger type of the data
      *
      * @return string|object serialized form of $data
      */
-    public static function sanitizeForSerialization($data)
+    public static function sanitizeForSerialization($data, $type = null, $format = null)
     {
         if (is_scalar($data) || null === $data) {
             return $data;
         } elseif ($data instanceof \DateTime) {
-            return $data->format(\DateTime::ATOM);
+            return ($format === 'date') ? $data->format('Y-m-d') : $data->format(\DateTime::ATOM);
         } elseif (is_array($data)) {
             foreach ($data as $property => $value) {
                 $data[$property] = self::sanitizeForSerialization($value);
@@ -59,6 +61,7 @@ class ObjectSerializer
             return $data;
         } elseif (is_object($data)) {
             $values = [];
+            $formats = $data::swaggerFormats();
             foreach ($data::swaggerTypes() as $property => $swaggerType) {
                 $getter = $data::getters()[$property];
                 $value = $data->$getter();
@@ -68,7 +71,7 @@ class ObjectSerializer
                     throw new \InvalidArgumentException("Invalid value for enum '$swaggerType', must be one of: '$imploded'");
                 }
                 if ($value !== null) {
-                    $values[$data::attributeMap()[$property]] = self::sanitizeForSerialization($value);
+                    $values[$data::attributeMap()[$property]] = self::sanitizeForSerialization($value, $swaggerType, $formats[$property]);
                 }
             }
             return (object)$values;
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Api/FakeApi.php b/samples/client/petstore/php/SwaggerClient-php/lib/Api/FakeApi.php
index ec943d9906f..916adfe43c2 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Api/FakeApi.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Api/FakeApi.php
@@ -90,8 +90,6 @@ class FakeApi
     /**
      * Operation fakeOuterBooleanSerialize
      *
-     * 
-     *
      * @param \Swagger\Client\Model\OuterBoolean $body Input boolean as post body (optional)
      * @throws \Swagger\Client\ApiException on non-2xx response
      * @return \Swagger\Client\Model\OuterBoolean
@@ -105,8 +103,6 @@ class FakeApi
     /**
      * Operation fakeOuterBooleanSerializeWithHttpInfo
      *
-     * 
-     *
      * @param \Swagger\Client\Model\OuterBoolean $body Input boolean as post body (optional)
      * @throws \Swagger\Client\ApiException on non-2xx response
      * @return array of \Swagger\Client\Model\OuterBoolean, HTTP status code, HTTP response headers (array of strings)
@@ -165,8 +161,6 @@ class FakeApi
     /**
      * Operation fakeOuterCompositeSerialize
      *
-     * 
-     *
      * @param \Swagger\Client\Model\OuterComposite $body Input composite as post body (optional)
      * @throws \Swagger\Client\ApiException on non-2xx response
      * @return \Swagger\Client\Model\OuterComposite
@@ -180,8 +174,6 @@ class FakeApi
     /**
      * Operation fakeOuterCompositeSerializeWithHttpInfo
      *
-     * 
-     *
      * @param \Swagger\Client\Model\OuterComposite $body Input composite as post body (optional)
      * @throws \Swagger\Client\ApiException on non-2xx response
      * @return array of \Swagger\Client\Model\OuterComposite, HTTP status code, HTTP response headers (array of strings)
@@ -240,8 +232,6 @@ class FakeApi
     /**
      * Operation fakeOuterNumberSerialize
      *
-     * 
-     *
      * @param \Swagger\Client\Model\OuterNumber $body Input number as post body (optional)
      * @throws \Swagger\Client\ApiException on non-2xx response
      * @return \Swagger\Client\Model\OuterNumber
@@ -255,8 +245,6 @@ class FakeApi
     /**
      * Operation fakeOuterNumberSerializeWithHttpInfo
      *
-     * 
-     *
      * @param \Swagger\Client\Model\OuterNumber $body Input number as post body (optional)
      * @throws \Swagger\Client\ApiException on non-2xx response
      * @return array of \Swagger\Client\Model\OuterNumber, HTTP status code, HTTP response headers (array of strings)
@@ -315,8 +303,6 @@ class FakeApi
     /**
      * Operation fakeOuterStringSerialize
      *
-     * 
-     *
      * @param \Swagger\Client\Model\OuterString $body Input string as post body (optional)
      * @throws \Swagger\Client\ApiException on non-2xx response
      * @return \Swagger\Client\Model\OuterString
@@ -330,8 +316,6 @@ class FakeApi
     /**
      * Operation fakeOuterStringSerializeWithHttpInfo
      *
-     * 
-     *
      * @param \Swagger\Client\Model\OuterString $body Input string as post body (optional)
      * @throws \Swagger\Client\ApiException on non-2xx response
      * @return array of \Swagger\Client\Model\OuterString, HTTP status code, HTTP response headers (array of strings)
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/AdditionalPropertiesClass.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/AdditionalPropertiesClass.php
index 8f901b731a2..14d068ffbe3 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/AdditionalPropertiesClass.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/AdditionalPropertiesClass.php
@@ -58,11 +58,25 @@ class AdditionalPropertiesClass implements ArrayAccess
         'map_of_map_property' => 'map[string,map[string,string]]'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'map_property' => null,
+        'map_of_map_property' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Animal.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Animal.php
index a0f1de3c08c..a0c94f0e553 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Animal.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Animal.php
@@ -58,11 +58,25 @@ class Animal implements ArrayAccess
         'color' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'class_name' => null,
+        'color' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/AnimalFarm.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/AnimalFarm.php
index d1736598716..30bace59f7a 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/AnimalFarm.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/AnimalFarm.php
@@ -57,11 +57,24 @@ class AnimalFarm implements ArrayAccess
         
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ApiResponse.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ApiResponse.php
index 95148c75e22..e20c4808486 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ApiResponse.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ApiResponse.php
@@ -59,11 +59,26 @@ class ApiResponse implements ArrayAccess
         'message' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'code' => 'int32',
+        'type' => null,
+        'message' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php
index 48f3b369b77..a615072618a 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php
@@ -57,11 +57,24 @@ class ArrayOfArrayOfNumberOnly implements ArrayAccess
         'array_array_number' => 'float[][]'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'array_array_number' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayOfNumberOnly.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayOfNumberOnly.php
index 103297a25e0..ab0e1b9f9e7 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayOfNumberOnly.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayOfNumberOnly.php
@@ -57,11 +57,24 @@ class ArrayOfNumberOnly implements ArrayAccess
         'array_number' => 'float[]'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'array_number' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayTest.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayTest.php
index f95c8cf869b..a723c141fb1 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayTest.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ArrayTest.php
@@ -59,11 +59,26 @@ class ArrayTest implements ArrayAccess
         'array_array_of_model' => '\Swagger\Client\Model\ReadOnlyFirst[][]'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'array_of_string' => null,
+        'array_array_of_integer' => 'int64',
+        'array_array_of_model' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Capitalization.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Capitalization.php
index 9e124413199..c1caafda4a8 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Capitalization.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Capitalization.php
@@ -62,11 +62,29 @@ class Capitalization implements ArrayAccess
         'att_name' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'small_camel' => null,
+        'capital_camel' => null,
+        'small_snake' => null,
+        'capital_snake' => null,
+        'sca_eth_flow_points' => null,
+        'att_name' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Cat.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Cat.php
index 611f01e36f4..2acf8d71d01 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Cat.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Cat.php
@@ -57,11 +57,24 @@ class Cat extends Animal implements ArrayAccess
         'declawed' => 'bool'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'declawed' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes + parent::swaggerTypes();
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats + parent::swaggerFormats();
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Category.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Category.php
index f8848cb956e..b1796844d4e 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Category.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Category.php
@@ -58,11 +58,25 @@ class Category implements ArrayAccess
         'name' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'id' => 'int64',
+        'name' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ClassModel.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ClassModel.php
index 18aa0fcbd4b..3fa669ece95 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ClassModel.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ClassModel.php
@@ -58,11 +58,24 @@ class ClassModel implements ArrayAccess
         '_class' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        '_class' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Client.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Client.php
index a6a09cfa3a7..34c82824f89 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Client.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Client.php
@@ -57,11 +57,24 @@ class Client implements ArrayAccess
         'client' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'client' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Dog.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Dog.php
index ba325f2f8bc..111de31a6d4 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Dog.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Dog.php
@@ -57,11 +57,24 @@ class Dog extends Animal implements ArrayAccess
         'breed' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'breed' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes + parent::swaggerTypes();
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats + parent::swaggerFormats();
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumArrays.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumArrays.php
index 34daaaa701e..ea05271e2d2 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumArrays.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumArrays.php
@@ -58,11 +58,25 @@ class EnumArrays implements ArrayAccess
         'array_enum' => 'string[]'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'just_symbol' => null,
+        'array_enum' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumClass.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumClass.php
index 1e12ea14587..44056f7a9df 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumClass.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumClass.php
@@ -37,7 +37,8 @@ namespace Swagger\Client\Model;
  * @author      Swagger Codegen team
  * @link        https://github.com/swagger-api/swagger-codegen
  */
-class EnumClass {
+class EnumClass
+{
     /**
      * Possible values of this enum
      */
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumTest.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumTest.php
index b3620adae3f..d4dcdb55ac2 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumTest.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/EnumTest.php
@@ -60,11 +60,27 @@ class EnumTest implements ArrayAccess
         'outer_enum' => '\Swagger\Client\Model\OuterEnum'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'enum_string' => null,
+        'enum_integer' => 'int32',
+        'enum_number' => 'double',
+        'outer_enum' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/FormatTest.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/FormatTest.php
index 400d9adf3c3..31ca7fbf138 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/FormatTest.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/FormatTest.php
@@ -69,11 +69,36 @@ class FormatTest implements ArrayAccess
         'password' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'integer' => null,
+        'int32' => 'int32',
+        'int64' => 'int64',
+        'number' => null,
+        'float' => 'float',
+        'double' => 'double',
+        'string' => null,
+        'byte' => 'byte',
+        'binary' => 'binary',
+        'date' => 'date',
+        'date_time' => 'date-time',
+        'uuid' => 'uuid',
+        'password' => 'password'
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/HasOnlyReadOnly.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/HasOnlyReadOnly.php
index 953f1550bbc..48335af8df5 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/HasOnlyReadOnly.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/HasOnlyReadOnly.php
@@ -58,11 +58,25 @@ class HasOnlyReadOnly implements ArrayAccess
         'foo' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'bar' => null,
+        'foo' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/MapTest.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/MapTest.php
index 4acee7ceeeb..5fb0c5a86fa 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/MapTest.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/MapTest.php
@@ -58,11 +58,25 @@ class MapTest implements ArrayAccess
         'map_of_enum_string' => 'map[string,string]'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'map_map_of_string' => null,
+        'map_of_enum_string' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
index a7b8eb94812..49a19cbef7c 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
@@ -59,11 +59,26 @@ class MixedPropertiesAndAdditionalPropertiesClass implements ArrayAccess
         'map' => 'map[string,\Swagger\Client\Model\Animal]'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'uuid' => 'uuid',
+        'date_time' => 'date-time',
+        'map' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Model200Response.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Model200Response.php
index 36473dc1dcc..f18c114ba63 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Model200Response.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Model200Response.php
@@ -59,11 +59,25 @@ class Model200Response implements ArrayAccess
         'class' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'name' => 'int32',
+        'class' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ModelList.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ModelList.php
index d2fae7b53f9..2cfe213eeba 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ModelList.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ModelList.php
@@ -57,11 +57,24 @@ class ModelList implements ArrayAccess
         '_123_list' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        '_123_list' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ModelReturn.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ModelReturn.php
index f959dbd5065..bbb1a8e6335 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ModelReturn.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ModelReturn.php
@@ -58,11 +58,24 @@ class ModelReturn implements ArrayAccess
         'return' => 'int'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'return' => 'int32'
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Name.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Name.php
index 61a6838537b..97ae1e0211f 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Name.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Name.php
@@ -61,11 +61,27 @@ class Name implements ArrayAccess
         '_123_number' => 'int'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'name' => 'int32',
+        'snake_case' => 'int32',
+        'property' => null,
+        '_123_number' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/NumberOnly.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/NumberOnly.php
index eb5e7f10698..8cc2f4e24f0 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/NumberOnly.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/NumberOnly.php
@@ -57,11 +57,24 @@ class NumberOnly implements ArrayAccess
         'just_number' => 'float'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'just_number' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Order.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Order.php
index 8871ecfbd97..e6f1c6c22f1 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Order.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Order.php
@@ -62,11 +62,29 @@ class Order implements ArrayAccess
         'complete' => 'bool'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'id' => 'int64',
+        'pet_id' => 'int64',
+        'quantity' => 'int32',
+        'ship_date' => 'date-time',
+        'status' => null,
+        'complete' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterBoolean.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterBoolean.php
index 34a56535ad3..7698e46c17f 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterBoolean.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterBoolean.php
@@ -57,11 +57,24 @@ class OuterBoolean implements ArrayAccess
         
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterComposite.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterComposite.php
index 1979b28f847..4165c715b44 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterComposite.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterComposite.php
@@ -59,11 +59,26 @@ class OuterComposite implements ArrayAccess
         'my_boolean' => '\Swagger\Client\Model\OuterBoolean'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'my_number' => null,
+        'my_string' => null,
+        'my_boolean' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterEnum.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterEnum.php
index e1247e2423e..6d2cbae69d1 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterEnum.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterEnum.php
@@ -37,7 +37,8 @@ namespace Swagger\Client\Model;
  * @author      Swagger Codegen team
  * @link        https://github.com/swagger-api/swagger-codegen
  */
-class OuterEnum {
+class OuterEnum
+{
     /**
      * Possible values of this enum
      */
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterNumber.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterNumber.php
index 3bf5d2fe4a0..79e25a83dff 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterNumber.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterNumber.php
@@ -57,11 +57,24 @@ class OuterNumber implements ArrayAccess
         
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterString.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterString.php
index 9e441c8d3fa..2e172dfaf9c 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterString.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/OuterString.php
@@ -57,11 +57,24 @@ class OuterString implements ArrayAccess
         
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Pet.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Pet.php
index 6cc91fe88fe..3f66a60e76d 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Pet.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Pet.php
@@ -62,11 +62,29 @@ class Pet implements ArrayAccess
         'status' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'id' => 'int64',
+        'category' => null,
+        'name' => null,
+        'photo_urls' => null,
+        'tags' => null,
+        'status' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ReadOnlyFirst.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ReadOnlyFirst.php
index b53677fc495..4bc008ba9c4 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ReadOnlyFirst.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ReadOnlyFirst.php
@@ -58,11 +58,25 @@ class ReadOnlyFirst implements ArrayAccess
         'baz' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'bar' => null,
+        'baz' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/SpecialModelName.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/SpecialModelName.php
index ac73ff0a376..da04522ec35 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/SpecialModelName.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/SpecialModelName.php
@@ -57,11 +57,24 @@ class SpecialModelName implements ArrayAccess
         'special_property_name' => 'int'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'special_property_name' => 'int64'
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Tag.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Tag.php
index 1705129380b..96026984207 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Tag.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Tag.php
@@ -58,11 +58,25 @@ class Tag implements ArrayAccess
         'name' => 'string'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'id' => 'int64',
+        'name' => null
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/Model/User.php b/samples/client/petstore/php/SwaggerClient-php/lib/Model/User.php
index 583a94ca57c..59dd2f7268c 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/User.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/User.php
@@ -64,11 +64,31 @@ class User implements ArrayAccess
         'user_status' => 'int'
     ];
 
+    /**
+      * Array of property to format mappings. Used for (de)serialization
+      * @var string[]
+      */
+    protected static $swaggerFormats = [
+        'id' => 'int64',
+        'username' => null,
+        'first_name' => null,
+        'last_name' => null,
+        'email' => null,
+        'password' => null,
+        'phone' => null,
+        'user_status' => 'int32'
+    ];
+
     public static function swaggerTypes()
     {
         return self::$swaggerTypes;
     }
 
+    public static function swaggerFormats()
+    {
+        return self::$swaggerFormats;
+    }
+
     /**
      * Array of attributes where the key is the local name, and the value is the original name
      * @var string[]
diff --git a/samples/client/petstore/php/SwaggerClient-php/lib/ObjectSerializer.php b/samples/client/petstore/php/SwaggerClient-php/lib/ObjectSerializer.php
index 32143b2c607..0f9f527a2ac 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/ObjectSerializer.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/ObjectSerializer.php
@@ -42,16 +42,18 @@ class ObjectSerializer
     /**
      * Serialize data
      *
-     * @param mixed $data the data to serialize
+     * @param mixed  $data   the data to serialize
+     * @param string $type   the SwaggerType of the data
+     * @param string $format the format of the Swagger type of the data
      *
      * @return string|object serialized form of $data
      */
-    public static function sanitizeForSerialization($data)
+    public static function sanitizeForSerialization($data, $type = null, $format = null)
     {
         if (is_scalar($data) || null === $data) {
             return $data;
         } elseif ($data instanceof \DateTime) {
-            return $data->format(\DateTime::ATOM);
+            return ($format === 'date') ? $data->format('Y-m-d') : $data->format(\DateTime::ATOM);
         } elseif (is_array($data)) {
             foreach ($data as $property => $value) {
                 $data[$property] = self::sanitizeForSerialization($value);
@@ -59,6 +61,7 @@ class ObjectSerializer
             return $data;
         } elseif (is_object($data)) {
             $values = [];
+            $formats = $data::swaggerFormats();
             foreach ($data::swaggerTypes() as $property => $swaggerType) {
                 $getter = $data::getters()[$property];
                 $value = $data->$getter();
@@ -68,7 +71,7 @@ class ObjectSerializer
                     throw new \InvalidArgumentException("Invalid value for enum '$swaggerType', must be one of: '$imploded'");
                 }
                 if ($value !== null) {
-                    $values[$data::attributeMap()[$property]] = self::sanitizeForSerialization($value);
+                    $values[$data::attributeMap()[$property]] = self::sanitizeForSerialization($value, $swaggerType, $formats[$property]);
                 }
             }
             return (object)$values;
diff --git a/samples/client/petstore/php/SwaggerClient-php/phpcs-generated-code.xml b/samples/client/petstore/php/SwaggerClient-php/phpcs-generated-code.xml
index a0173077aa9..af658f0b999 100644
--- a/samples/client/petstore/php/SwaggerClient-php/phpcs-generated-code.xml
+++ b/samples/client/petstore/php/SwaggerClient-php/phpcs-generated-code.xml
@@ -4,7 +4,14 @@
  <description>Arnes Drupal code checker</description>
 
  <rule ref="PSR2" />
- <rule ref="Generic.Files.LineLength">
+
+ <!-- Getting rid of extra newlines at the end of generated files is not worth the trouble -->
+ <rule ref="PSR2.Files.EndFileNewline.TooMany">
+   <exclude-pattern>*</exclude-pattern>
+ </rule>
+
+ <!-- Avoiding generating code lines to grow too long is not worth the trouble -->
+ <rule ref="Generic.Files.LineLength.TooLong">
    <exclude-pattern>*</exclude-pattern>
  </rule>
 </ruleset>
diff --git a/samples/client/petstore/php/SwaggerClient-php/tests/DateTimeSerializerTest.php b/samples/client/petstore/php/SwaggerClient-php/tests/DateTimeSerializerTest.php
new file mode 100644
index 00000000000..cea8db4a067
--- /dev/null
+++ b/samples/client/petstore/php/SwaggerClient-php/tests/DateTimeSerializerTest.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Swagger\Client;
+
+use Swagger\Client\Model\FormatTest;
+
+class DateTimeSerializerTest extends \PHPUnit_Framework_TestCase
+{
+    public function testDateTimeSanitazion()
+    {
+        $dateTime = new \DateTime('April 30, 1973 17:05 CEST');
+
+        $input = new FormatTest([
+            'date_time' => $dateTime,
+        ]);
+
+        $data = ObjectSerializer::sanitizeForSerialization($input);
+
+        $this->assertEquals($data->dateTime, '1973-04-30T17:05:00+02:00');
+    }
+
+    public function testDateSanitazion()
+    {
+        $dateTime = new \DateTime('April 30, 1973 17:05 CEST');
+
+        $input = new FormatTest([
+            'date' => $dateTime,
+        ]);
+
+        $data = ObjectSerializer::sanitizeForSerialization($input);
+
+        $this->assertEquals($data->date, '1973-04-30');
+    }
+}
diff --git a/samples/client/petstore/php/SwaggerClient-php/tests/PetApiTest.php b/samples/client/petstore/php/SwaggerClient-php/tests/PetApiTest.php
index bad55050ece..368b5f6df50 100644
--- a/samples/client/petstore/php/SwaggerClient-php/tests/PetApiTest.php
+++ b/samples/client/petstore/php/SwaggerClient-php/tests/PetApiTest.php
@@ -349,7 +349,6 @@ class PetApiTest extends \PHPUnit_Framework_TestCase
         $response = $pet_api->uploadFile($pet_id, "test meta", "./composer.json");
         // return ApiResponse
         $this->assertInstanceOf('Swagger\Client\Model\ApiResponse', $response);
-
     }
   
     // test get inventory
@@ -402,7 +401,6 @@ class PetApiTest extends \PHPUnit_Framework_TestCase
         $new_pet = new Model\Pet;
         // the empty object should be serialised to {}
         $this->assertSame("{}", "$new_pet");
-
     }
 
     // test inheritance in the model
@@ -493,6 +491,7 @@ class PetApiTest extends \PHPUnit_Framework_TestCase
         $pet_host = $pet_api->getApiClient()->getConfig()->getHost();
         $this->assertSame($pet_host, $new_default->getHost());
 
-        Configuration::setDefaultConfiguration($orig_default); // Reset to original to prevent failure of other tests that rely on this state
+        // Reset to original to prevent failure of other tests that rely on this state
+        Configuration::setDefaultConfiguration($orig_default);
     }
 }
diff --git a/samples/client/petstore/php/SwaggerClient-php/tests/UserApiTest.php b/samples/client/petstore/php/SwaggerClient-php/tests/UserApiTest.php
index a8487e58764..701479bab05 100644
--- a/samples/client/petstore/php/SwaggerClient-php/tests/UserApiTest.php
+++ b/samples/client/petstore/php/SwaggerClient-php/tests/UserApiTest.php
@@ -29,6 +29,5 @@ class UserApiTest extends \PHPUnit_Framework_TestCase
             $response,
             "response string starts with 'logged in user session'"
         );
-
     }
 }