diff --git a/modules/openapi-generator/src/main/resources/php-nextgen/ObjectSerializer.mustache b/modules/openapi-generator/src/main/resources/php-nextgen/ObjectSerializer.mustache
index 8c8b10a39343..b48c1b911ecb 100644
--- a/modules/openapi-generator/src/main/resources/php-nextgen/ObjectSerializer.mustache
+++ b/modules/openapi-generator/src/main/resources/php-nextgen/ObjectSerializer.mustache
@@ -377,7 +377,6 @@ class ObjectSerializer
      * @param mixed         $data          object or primitive to be deserialized
      * @param string        $class         class name is passed as a string
      * @param string[]|null $httpHeaders   HTTP headers
-     * @param string|null   $discriminator discriminator if polymorphism is used
      *
      * @return mixed a single or an array of $class instances
      */
diff --git a/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache b/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
index 938e213aabb0..6fe5101c306a 100644
--- a/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
+++ b/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
@@ -387,7 +387,6 @@ class ObjectSerializer
      * @param mixed    $data          object or primitive to be deserialized
      * @param string   $class         class name is passed as a string
      * @param string[] $httpHeaders   HTTP headers
-     * @param string   $discriminator discriminator if polymorphism is used
      *
      * @return object|array|null a single or an array of $class instances
      */
diff --git a/samples/client/echo_api/php-nextgen/src/ObjectSerializer.php b/samples/client/echo_api/php-nextgen/src/ObjectSerializer.php
index 1f9c52c426c7..f161a39ea263 100644
--- a/samples/client/echo_api/php-nextgen/src/ObjectSerializer.php
+++ b/samples/client/echo_api/php-nextgen/src/ObjectSerializer.php
@@ -387,7 +387,6 @@ public static function serializeCollection(array $collection, string $style, boo
      * @param mixed         $data          object or primitive to be deserialized
      * @param string        $class         class name is passed as a string
      * @param string[]|null $httpHeaders   HTTP headers
-     * @param string|null   $discriminator discriminator if polymorphism is used
      *
      * @return mixed a single or an array of $class instances
      */
diff --git a/samples/client/petstore/php-nextgen/OpenAPIClient-php/lib/ObjectSerializer.php b/samples/client/petstore/php-nextgen/OpenAPIClient-php/lib/ObjectSerializer.php
index 55a2501c101a..e3e49406733f 100644
--- a/samples/client/petstore/php-nextgen/OpenAPIClient-php/lib/ObjectSerializer.php
+++ b/samples/client/petstore/php-nextgen/OpenAPIClient-php/lib/ObjectSerializer.php
@@ -396,7 +396,6 @@ public static function serializeCollection(array $collection, $style, $allowColl
      * @param mixed    $data          object or primitive to be deserialized
      * @param string   $class         class name is passed as a string
      * @param string[] $httpHeaders   HTTP headers
-     * @param string   $discriminator discriminator if polymorphism is used
      *
      * @return object|array|null a single or an array of $class instances
      */
diff --git a/samples/client/petstore/php-nextgen/OpenAPIClient-php/src/ObjectSerializer.php b/samples/client/petstore/php-nextgen/OpenAPIClient-php/src/ObjectSerializer.php
index 01ba2309ca5b..de473b59f448 100644
--- a/samples/client/petstore/php-nextgen/OpenAPIClient-php/src/ObjectSerializer.php
+++ b/samples/client/petstore/php-nextgen/OpenAPIClient-php/src/ObjectSerializer.php
@@ -386,7 +386,6 @@ public static function serializeCollection(array $collection, string $style, boo
      * @param mixed         $data          object or primitive to be deserialized
      * @param string        $class         class name is passed as a string
      * @param string[]|null $httpHeaders   HTTP headers
-     * @param string|null   $discriminator discriminator if polymorphism is used
      *
      * @return mixed a single or an array of $class instances
      */
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php b/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
index f806641452d8..050aa4959c0c 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
@@ -396,7 +396,6 @@ public static function serializeCollection(array $collection, $style, $allowColl
      * @param mixed    $data          object or primitive to be deserialized
      * @param string   $class         class name is passed as a string
      * @param string[] $httpHeaders   HTTP headers
-     * @param string   $discriminator discriminator if polymorphism is used
      *
      * @return object|array|null a single or an array of $class instances
      */
diff --git a/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php b/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php
index f806641452d8..050aa4959c0c 100644
--- a/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php
+++ b/samples/client/petstore/php/psr-18/lib/ObjectSerializer.php
@@ -396,7 +396,6 @@ public static function serializeCollection(array $collection, $style, $allowColl
      * @param mixed    $data          object or primitive to be deserialized
      * @param string   $class         class name is passed as a string
      * @param string[] $httpHeaders   HTTP headers
-     * @param string   $discriminator discriminator if polymorphism is used
      *
      * @return object|array|null a single or an array of $class instances
      */