diff --git a/modules/swagger-codegen/src/main/resources/php/model.mustache b/modules/swagger-codegen/src/main/resources/php/model.mustache
index f4f415cd4a4..55a7e4458a1 100644
--- a/modules/swagger-codegen/src/main/resources/php/model.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/model.mustache
@@ -140,7 +140,7 @@ class {{classname}} {{#parent}}extends {{{parent}}} {{/parent}}implements ArrayA
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         {{#vars}}{{#required}}
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 82d29699f8a..efe77d9b11c 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Animal.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Animal.php
@@ -129,7 +129,7 @@ class Animal implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 e6e7b7bcd84..0d1177f5e45 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ApiResponse.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ApiResponse.php
@@ -150,7 +150,7 @@ class ApiResponse implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 4bc0f89d9e2..ba8eee4b01a 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Cat.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Cat.php
@@ -126,7 +126,7 @@ class Cat extends Animal implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 55b391feabd..4fd9c42c290 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Category.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Category.php
@@ -138,7 +138,7 @@ class Category implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 d092850ab79..7030ea05758 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Dog.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Dog.php
@@ -126,7 +126,7 @@ class Dog extends Animal implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 6f5c75d28eb..a0e4d2ba61f 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/FormatTest.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/FormatTest.php
@@ -258,7 +258,7 @@ class FormatTest implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 1ee9011b8f7..f69261948e1 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Model200Response.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Model200Response.php
@@ -126,7 +126,7 @@ class Model200Response implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 d15f82a5057..83ba9847e12 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/ModelReturn.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/ModelReturn.php
@@ -126,7 +126,7 @@ class ModelReturn implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 991ab945b4e..8d5b38d5882 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Name.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Name.php
@@ -150,7 +150,7 @@ class Name implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 a7b6b22f4c7..9a799156399 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Order.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Order.php
@@ -186,7 +186,7 @@ class Order implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 319d23a839e..aacb34bd446 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Pet.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Pet.php
@@ -186,7 +186,7 @@ class Pet implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 200470d99d2..7bd4390758f 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/SpecialModelName.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/SpecialModelName.php
@@ -126,7 +126,7 @@ class SpecialModelName implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 e493bdfd3e3..50ded1a259c 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/Tag.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/Tag.php
@@ -138,7 +138,7 @@ class Tag implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();
         
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 3b09cea0fd2..3c95ec1638b 100644
--- a/samples/client/petstore/php/SwaggerClient-php/lib/Model/User.php
+++ b/samples/client/petstore/php/SwaggerClient-php/lib/Model/User.php
@@ -210,7 +210,7 @@ class User implements ArrayAccess
      * 
      * @return array invalid properties with reasons
      */
-    public function list_invalid_properties()
+    public function listInvalidProperties()
     {
         $invalid_properties = array();