diff --git a/modules/swagger-codegen/src/main/resources/php/api.mustache b/modules/swagger-codegen/src/main/resources/php/api.mustache
index e040c6cc5f2..4fd50fa898b 100644
--- a/modules/swagger-codegen/src/main/resources/php/api.mustache
+++ b/modules/swagger-codegen/src/main/resources/php/api.mustache
@@ -49,20 +49,20 @@ class {{classname}} {
       $headerParams['Content-Type'] = '{{#consumes}}{{mediaType}}{{#hasMore}},{{/hasMore}}{{/consumes}}';
 
       {{#queryParams}}// query params
-      if(${{paramName}} != null) {
+      if(${{paramName}} !== null) {
   		  $queryParams['{{paramName}}'] = $this->apiClient->toQueryValue(${{paramName}});
   		}{{/queryParams}}
       {{#headerParams}}// header params
-      if(${{paramName}} != null) {
+      if(${{paramName}} !== null) {
   		 	$headerParams['{{paramName}}'] = $this->apiClient->toHeaderValue(${{paramName}});
   		}{{/headerParams}}
       {{#pathParams}}// path params
-      if(${{paramName}} != null) {
+      if(${{paramName}} !== null) {
   			$resourcePath = str_replace("{" . "{{paramName}}" . "}",
   			                            $this->apiClient->toPathValue(${{paramName}}), $resourcePath);
   		}{{/pathParams}}
       {{#formParams}}
-      if (${{paramName}} != null) {
+      if (${{paramName}} !== null) {
         $formParams[{{paramName}}] = {{#isFile}}'@' . {{/isFile}}${{paramName}};
       }{{/formParams}}
       {{#bodyParams}}// body params
diff --git a/samples/client/petstore/php/PetApi.php b/samples/client/petstore/php/PetApi.php
index 4a577a0c2e3..da31002dcbb 100644
--- a/samples/client/petstore/php/PetApi.php
+++ b/samples/client/petstore/php/PetApi.php
@@ -138,7 +138,7 @@ public function findPetsByStatus($status) {
       $headerParams['Content-Type'] = '';
 
       // query params
-      if($status != null) {
+      if($status !== null) {
   		  $queryParams['status'] = $this->apiClient->toQueryValue($status);
   		}
       
@@ -188,7 +188,7 @@ public function findPetsByTags($tags) {
       $headerParams['Content-Type'] = '';
 
       // query params
-      if($tags != null) {
+      if($tags !== null) {
   		  $queryParams['tags'] = $this->apiClient->toQueryValue($tags);
   		}
       
@@ -240,7 +240,7 @@ public function getPetById($petId) {
       
       
       // path params
-      if($petId != null) {
+      if($petId !== null) {
   			$resourcePath = str_replace("{" . "petId" . "}",
   			                            $this->apiClient->toPathValue($petId), $resourcePath);
   		}
@@ -293,15 +293,15 @@ public function updatePetWithForm($petId, $name, $status) {
       
       
       // path params
-      if($petId != null) {
+      if($petId !== null) {
   			$resourcePath = str_replace("{" . "petId" . "}",
   			                            $this->apiClient->toPathValue($petId), $resourcePath);
   		}
       
-      if ($name != null) {
+      if ($name !== null) {
         $formParams[name] = $name;
       }
-      if ($status != null) {
+      if ($status !== null) {
         $formParams[status] = $status;
       }
       
@@ -344,11 +344,11 @@ public function deletePet($api_key, $petId) {
 
       
       // header params
-      if($api_key != null) {
+      if($api_key !== null) {
   		 	$headerParams['api_key'] = $this->apiClient->toHeaderValue($api_key);
   		}
       // path params
-      if($petId != null) {
+      if($petId !== null) {
   			$resourcePath = str_replace("{" . "petId" . "}",
   			                            $this->apiClient->toPathValue($petId), $resourcePath);
   		}
@@ -373,13 +373,14 @@ public function deletePet($api_key, $petId) {
 	 * uploadFile
    *
 	 * uploads an image
-   * additionalMetadata, string: Additional data to pass to server (required)
+   * petId, int: ID of pet to update (required)
+   * * additionalMetadata, string: Additional data to pass to server (required)
    * * file, file: file to upload (required)
    * 
 	 * @return 
 	 */
 
-   public function uploadFile($additionalMetadata, $file) {
+   public function uploadFile($petId, $additionalMetadata, $file) {
 
   		// parse inputs
   		$resourcePath = "/pet/{petId}/uploadImage";
@@ -393,12 +394,16 @@ public function uploadFile($additionalMetadata, $file) {
 
       
       
+      // path params
+      if($petId !== null) {
+  			$resourcePath = str_replace("{" . "petId" . "}",
+  			                            $this->apiClient->toPathValue($petId), $resourcePath);
+  		}
       
-      
-      if ($additionalMetadata != null) {
+      if ($additionalMetadata !== null) {
         $formParams[additionalMetadata] = $additionalMetadata;
       }
-      if ($file != null) {
+      if ($file !== null) {
         $formParams[file] = '@' . $file;
       }
       
diff --git a/samples/client/petstore/php/StoreApi.php b/samples/client/petstore/php/StoreApi.php
index 9c46ea67036..0496c08d2e8 100644
--- a/samples/client/petstore/php/StoreApi.php
+++ b/samples/client/petstore/php/StoreApi.php
@@ -147,7 +147,7 @@ public function getOrderById($orderId) {
       
       
       // path params
-      if($orderId != null) {
+      if($orderId !== null) {
   			$resourcePath = str_replace("{" . "orderId" . "}",
   			                            $this->apiClient->toPathValue($orderId), $resourcePath);
   		}
@@ -198,7 +198,7 @@ public function deleteOrder($orderId) {
       
       
       // path params
-      if($orderId != null) {
+      if($orderId !== null) {
   			$resourcePath = str_replace("{" . "orderId" . "}",
   			                            $this->apiClient->toPathValue($orderId), $resourcePath);
   		}
diff --git a/samples/client/petstore/php/UserApi.php b/samples/client/petstore/php/UserApi.php
index 23d6b5d117a..697af96328b 100644
--- a/samples/client/petstore/php/UserApi.php
+++ b/samples/client/petstore/php/UserApi.php
@@ -184,10 +184,10 @@ public function loginUser($username, $password) {
       $headerParams['Content-Type'] = '';
 
       // query params
-      if($username != null) {
+      if($username !== null) {
   		  $queryParams['username'] = $this->apiClient->toQueryValue($username);
   		}// query params
-      if($password != null) {
+      if($password !== null) {
   		  $queryParams['password'] = $this->apiClient->toQueryValue($password);
   		}
       
@@ -279,7 +279,7 @@ public function getUserByName($username) {
       
       
       // path params
-      if($username != null) {
+      if($username !== null) {
   			$resourcePath = str_replace("{" . "username" . "}",
   			                            $this->apiClient->toPathValue($username), $resourcePath);
   		}
@@ -331,7 +331,7 @@ public function updateUser($username, $body) {
       
       
       // path params
-      if($username != null) {
+      if($username !== null) {
   			$resourcePath = str_replace("{" . "username" . "}",
   			                            $this->apiClient->toPathValue($username), $resourcePath);
   		}
@@ -380,7 +380,7 @@ public function deleteUser($username) {
       
       
       // path params
-      if($username != null) {
+      if($username !== null) {
   			$resourcePath = str_replace("{" . "username" . "}",
   			                            $this->apiClient->toPathValue($username), $resourcePath);
   		}