diff --git a/modules/openapi-generator/src/main/resources/php/.travis.yml b/modules/openapi-generator/src/main/resources/php/.travis.yml
index b4b1d0a6b5a6..714772ee9310 100644
--- a/modules/openapi-generator/src/main/resources/php/.travis.yml
+++ b/modules/openapi-generator/src/main/resources/php/.travis.yml
@@ -3,7 +3,6 @@ language: php
 # https://docs.travis-ci.com/user/reference/bionic/#php-support
 dist: bionic
 php:
-    - 7.2
     - 7.3
     - 7.4
 before_install: "composer install"
diff --git a/modules/openapi-generator/src/main/resources/php/ApiException.mustache b/modules/openapi-generator/src/main/resources/php/ApiException.mustache
index dcba96b0e43a..a69af3008443 100644
--- a/modules/openapi-generator/src/main/resources/php/ApiException.mustache
+++ b/modules/openapi-generator/src/main/resources/php/ApiException.mustache
@@ -1,7 +1,7 @@
 <?php
 /**
  * ApiException
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/Configuration.mustache b/modules/openapi-generator/src/main/resources/php/Configuration.mustache
index fa4f1ebecee8..d186b10861cc 100644
--- a/modules/openapi-generator/src/main/resources/php/Configuration.mustache
+++ b/modules/openapi-generator/src/main/resources/php/Configuration.mustache
@@ -1,7 +1,7 @@
 <?php
 /**
  * Configuration
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  {{invokerPackage}}
@@ -20,7 +20,7 @@ namespace {{invokerPackage}};
 
 /**
  * Configuration Class Doc Comment
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/HeaderSelector.mustache b/modules/openapi-generator/src/main/resources/php/HeaderSelector.mustache
index 5f8e65587279..6dd03c8337d0 100644
--- a/modules/openapi-generator/src/main/resources/php/HeaderSelector.mustache
+++ b/modules/openapi-generator/src/main/resources/php/HeaderSelector.mustache
@@ -1,7 +1,7 @@
 <?php
 /**
  * ApiException
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/ModelInterface.mustache b/modules/openapi-generator/src/main/resources/php/ModelInterface.mustache
index fb19c248437a..417ca5d56e33 100644
--- a/modules/openapi-generator/src/main/resources/php/ModelInterface.mustache
+++ b/modules/openapi-generator/src/main/resources/php/ModelInterface.mustache
@@ -2,7 +2,7 @@
 /**
  * ModelInterface
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  {{modelPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache b/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
index 0d8490f057ed..b9704b153f43 100644
--- a/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
+++ b/modules/openapi-generator/src/main/resources/php/ObjectSerializer.mustache
@@ -2,7 +2,7 @@
 /**
  * ObjectSerializer
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/README.mustache b/modules/openapi-generator/src/main/resources/php/README.mustache
index 544c6fe9d9c6..1bb83fb56be3 100644
--- a/modules/openapi-generator/src/main/resources/php/README.mustache
+++ b/modules/openapi-generator/src/main/resources/php/README.mustache
@@ -12,7 +12,8 @@ For more information, please visit [{{{infoUrl}}}]({{{infoUrl}}}).
 
 ### Requirements
 
-PHP 7.2 and later.
+PHP 7.3 and later.
+Should also work with PHP 8.0 but has not been tested.
 
 ### Composer
 
diff --git a/modules/openapi-generator/src/main/resources/php/api.mustache b/modules/openapi-generator/src/main/resources/php/api.mustache
index 206c0a25826a..458862992172 100644
--- a/modules/openapi-generator/src/main/resources/php/api.mustache
+++ b/modules/openapi-generator/src/main/resources/php/api.mustache
@@ -1,7 +1,7 @@
 <?php
 /**
  * {{classname}}
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/api_test.mustache b/modules/openapi-generator/src/main/resources/php/api_test.mustache
index f46fdbac144b..6685fe5d5e07 100644
--- a/modules/openapi-generator/src/main/resources/php/api_test.mustache
+++ b/modules/openapi-generator/src/main/resources/php/api_test.mustache
@@ -1,7 +1,7 @@
 <?php
 /**
  * {{classname}}Test
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/composer.mustache b/modules/openapi-generator/src/main/resources/php/composer.mustache
index 265bd713d521..08cd8f6bfdf4 100644
--- a/modules/openapi-generator/src/main/resources/php/composer.mustache
+++ b/modules/openapi-generator/src/main/resources/php/composer.mustache
@@ -22,7 +22,7 @@
         }
     ],
     "require": {
-        "php": ">=7.2",
+        "php": "^7.3 || ^8.0",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
diff --git a/modules/openapi-generator/src/main/resources/php/model.mustache b/modules/openapi-generator/src/main/resources/php/model.mustache
index d1450f72cbf6..e2c6458df080 100644
--- a/modules/openapi-generator/src/main/resources/php/model.mustache
+++ b/modules/openapi-generator/src/main/resources/php/model.mustache
@@ -4,7 +4,7 @@
 /**
  * {{classname}}
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/modules/openapi-generator/src/main/resources/php/model_test.mustache b/modules/openapi-generator/src/main/resources/php/model_test.mustache
index af9df8ae19b8..0f54973065f9 100644
--- a/modules/openapi-generator/src/main/resources/php/model_test.mustache
+++ b/modules/openapi-generator/src/main/resources/php/model_test.mustache
@@ -4,7 +4,7 @@
 /**
  * {{classname}}Test
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  {{invokerPackage}}
diff --git a/samples/client/petstore/php/OpenAPIClient-php/.travis.yml b/samples/client/petstore/php/OpenAPIClient-php/.travis.yml
index b4b1d0a6b5a6..714772ee9310 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/.travis.yml
+++ b/samples/client/petstore/php/OpenAPIClient-php/.travis.yml
@@ -3,7 +3,6 @@ language: php
 # https://docs.travis-ci.com/user/reference/bionic/#php-support
 dist: bionic
 php:
-    - 7.2
     - 7.3
     - 7.4
 before_install: "composer install"
diff --git a/samples/client/petstore/php/OpenAPIClient-php/README.md b/samples/client/petstore/php/OpenAPIClient-php/README.md
index 87bccb9f41f7..9e8da12558b3 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/README.md
+++ b/samples/client/petstore/php/OpenAPIClient-php/README.md
@@ -7,7 +7,8 @@ This spec is mainly for testing Petstore server and contains fake endpoints, mod
 
 ### Requirements
 
-PHP 7.2 and later.
+PHP 7.3 and later.
+Should also work with PHP 8.0 but has not been tested.
 
 ### Composer
 
diff --git a/samples/client/petstore/php/OpenAPIClient-php/composer.json b/samples/client/petstore/php/OpenAPIClient-php/composer.json
index 08efaa27b921..bbdfc4692fd7 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/composer.json
+++ b/samples/client/petstore/php/OpenAPIClient-php/composer.json
@@ -19,7 +19,7 @@
         }
     ],
     "require": {
-        "php": ">=7.2",
+        "php": "^7.3 || ^8.0",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-mbstring": "*",
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/AnotherFakeApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/AnotherFakeApi.php
index 18f6dc801ced..fcc84cb6363e 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/AnotherFakeApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/AnotherFakeApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * AnotherFakeApi
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/DefaultApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/DefaultApi.php
index 675a7fafee8b..de54ffd1fc86 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/DefaultApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/DefaultApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * DefaultApi
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeApi.php
index 52cbb0ae79e7..c9ca32be9bfa 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * FakeApi
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeClassnameTags123Api.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeClassnameTags123Api.php
index 7312f1e1b0d5..4348ae44d284 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeClassnameTags123Api.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/FakeClassnameTags123Api.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * FakeClassnameTags123Api
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/PetApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/PetApi.php
index 59e3bf28fcbb..2f035ffc4f0a 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/PetApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/PetApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * PetApi
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/StoreApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/StoreApi.php
index 982cadd4c8ff..a2891ba7747b 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/StoreApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/StoreApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * StoreApi
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/UserApi.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/UserApi.php
index 9189423bf576..328e58fff3ed 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Api/UserApi.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Api/UserApi.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * UserApi
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/ApiException.php b/samples/client/petstore/php/OpenAPIClient-php/lib/ApiException.php
index 46f957e474b2..f22a4019e5b0 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/ApiException.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/ApiException.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * ApiException
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Configuration.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Configuration.php
index 976d61a6ad4d..d699873d37b1 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Configuration.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Configuration.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * Configuration
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
@@ -29,7 +29,7 @@
 
 /**
  * Configuration Class Doc Comment
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/HeaderSelector.php b/samples/client/petstore/php/OpenAPIClient-php/lib/HeaderSelector.php
index 26f7eb622fdd..bc497ef88449 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/HeaderSelector.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/HeaderSelector.php
@@ -1,7 +1,7 @@
 <?php
 /**
  * ApiException
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AdditionalPropertiesClass.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AdditionalPropertiesClass.php
index 6dd3a61637f3..32718c8ae6de 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AdditionalPropertiesClass.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/AdditionalPropertiesClass.php
@@ -2,7 +2,7 @@
 /**
  * AdditionalPropertiesClass
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Animal.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Animal.php
index f5f9533cc0b8..839579d7f25a 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Animal.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Animal.php
@@ -2,7 +2,7 @@
 /**
  * Animal
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ApiResponse.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ApiResponse.php
index c72c5ed35198..46011f3f618b 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ApiResponse.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ApiResponse.php
@@ -2,7 +2,7 @@
 /**
  * ApiResponse
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php
index 9d560cfb80a4..ddfe3144afef 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfArrayOfNumberOnly.php
@@ -2,7 +2,7 @@
 /**
  * ArrayOfArrayOfNumberOnly
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfNumberOnly.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfNumberOnly.php
index f445a5aa7cca..7494ceaf0b10 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfNumberOnly.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayOfNumberOnly.php
@@ -2,7 +2,7 @@
 /**
  * ArrayOfNumberOnly
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayTest.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayTest.php
index bb75e996f8a0..b7f583f45989 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayTest.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ArrayTest.php
@@ -2,7 +2,7 @@
 /**
  * ArrayTest
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Capitalization.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Capitalization.php
index cac15a056ab2..8dd06a695406 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Capitalization.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Capitalization.php
@@ -2,7 +2,7 @@
 /**
  * Capitalization
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Cat.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Cat.php
index c75f8def53e7..9b019e7d85c9 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Cat.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Cat.php
@@ -2,7 +2,7 @@
 /**
  * Cat
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/CatAllOf.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/CatAllOf.php
index 00248db7acaa..69d00528fa4c 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/CatAllOf.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/CatAllOf.php
@@ -2,7 +2,7 @@
 /**
  * CatAllOf
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Category.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Category.php
index b2d606b17a61..4e5551fbfff8 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Category.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Category.php
@@ -2,7 +2,7 @@
 /**
  * Category
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ClassModel.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ClassModel.php
index 2f5f8aa50a40..fefbc42a3058 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ClassModel.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ClassModel.php
@@ -2,7 +2,7 @@
 /**
  * ClassModel
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Client.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Client.php
index cf13437b7bf5..48c8d033ca17 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Client.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Client.php
@@ -2,7 +2,7 @@
 /**
  * Client
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DeprecatedObject.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DeprecatedObject.php
index 4284eef9b485..635d3dd4e350 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DeprecatedObject.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DeprecatedObject.php
@@ -2,7 +2,7 @@
 /**
  * DeprecatedObject
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Dog.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Dog.php
index fd761dff5da9..2a46e2e36b97 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Dog.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Dog.php
@@ -2,7 +2,7 @@
 /**
  * Dog
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DogAllOf.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DogAllOf.php
index bd0b1bdf50d4..f001f9396387 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DogAllOf.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/DogAllOf.php
@@ -2,7 +2,7 @@
 /**
  * DogAllOf
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumArrays.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumArrays.php
index 4ea8dbd5e8a8..10631dd74cb9 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumArrays.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumArrays.php
@@ -2,7 +2,7 @@
 /**
  * EnumArrays
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumClass.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumClass.php
index 3c1dd121bf9b..c3642d879ab2 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumClass.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumClass.php
@@ -2,7 +2,7 @@
 /**
  * EnumClass
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumTest.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumTest.php
index d9afb7d7910b..3d4c151ad1dc 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumTest.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/EnumTest.php
@@ -2,7 +2,7 @@
 /**
  * EnumTest
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/File.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/File.php
index 44bcedc6fd07..61fb7ae2ba79 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/File.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/File.php
@@ -2,7 +2,7 @@
 /**
  * File
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FileSchemaTestClass.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FileSchemaTestClass.php
index c673343b5770..2d870ec29077 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FileSchemaTestClass.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FileSchemaTestClass.php
@@ -2,7 +2,7 @@
 /**
  * FileSchemaTestClass
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Foo.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Foo.php
index ecd23b4453e7..13172225bebc 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Foo.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Foo.php
@@ -2,7 +2,7 @@
 /**
  * Foo
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FormatTest.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FormatTest.php
index a529c2bbb7e4..8951e0240a25 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FormatTest.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/FormatTest.php
@@ -2,7 +2,7 @@
 /**
  * FormatTest
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HasOnlyReadOnly.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HasOnlyReadOnly.php
index 4ecd0e9fa5ef..be785cb487e6 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HasOnlyReadOnly.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HasOnlyReadOnly.php
@@ -2,7 +2,7 @@
 /**
  * HasOnlyReadOnly
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HealthCheckResult.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HealthCheckResult.php
index 59994c7a4a4f..6293d7ef43b1 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HealthCheckResult.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/HealthCheckResult.php
@@ -2,7 +2,7 @@
 /**
  * HealthCheckResult
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/InlineResponseDefault.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/InlineResponseDefault.php
index a9ee8ef4aeb9..86ac6ead27e5 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/InlineResponseDefault.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/InlineResponseDefault.php
@@ -2,7 +2,7 @@
 /**
  * InlineResponseDefault
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MapTest.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MapTest.php
index 15e499a810df..3dd8e1c5121d 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MapTest.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MapTest.php
@@ -2,7 +2,7 @@
 /**
  * MapTest
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
index 338cbb970bad..c5444de3bc57 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/MixedPropertiesAndAdditionalPropertiesClass.php
@@ -2,7 +2,7 @@
 /**
  * MixedPropertiesAndAdditionalPropertiesClass
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Model200Response.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Model200Response.php
index ffe5cd510ef1..b29bdd2418c5 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Model200Response.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Model200Response.php
@@ -2,7 +2,7 @@
 /**
  * Model200Response
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelInterface.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelInterface.php
index 100ad55db791..4a973bead881 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelInterface.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelInterface.php
@@ -2,7 +2,7 @@
 /**
  * ModelInterface
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client\Model
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelList.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelList.php
index 0a1638a3e660..6c48d5f884ec 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelList.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelList.php
@@ -2,7 +2,7 @@
 /**
  * ModelList
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelReturn.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelReturn.php
index e34629c80f64..02fbfa873588 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelReturn.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ModelReturn.php
@@ -2,7 +2,7 @@
 /**
  * ModelReturn
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Name.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Name.php
index a4dcd0bc6bcc..452d9c458f7b 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Name.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Name.php
@@ -2,7 +2,7 @@
 /**
  * Name
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NullableClass.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NullableClass.php
index f5081f1efddc..532b18f6a25b 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NullableClass.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NullableClass.php
@@ -2,7 +2,7 @@
 /**
  * NullableClass
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NumberOnly.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NumberOnly.php
index ae31e4c734d8..01cb90dc3813 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NumberOnly.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/NumberOnly.php
@@ -2,7 +2,7 @@
 /**
  * NumberOnly
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ObjectWithDeprecatedFields.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ObjectWithDeprecatedFields.php
index fd76f31a9126..2129a3c4e5f9 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ObjectWithDeprecatedFields.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ObjectWithDeprecatedFields.php
@@ -2,7 +2,7 @@
 /**
  * ObjectWithDeprecatedFields
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Order.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Order.php
index 0873a47c9d4d..8e46653a439c 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Order.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Order.php
@@ -2,7 +2,7 @@
 /**
  * Order
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterComposite.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterComposite.php
index d393491bb84f..a9244433e017 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterComposite.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterComposite.php
@@ -2,7 +2,7 @@
 /**
  * OuterComposite
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnum.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnum.php
index 553e958abde0..689af0968802 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnum.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnum.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnum
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumDefaultValue.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumDefaultValue.php
index 3832c316a4c5..f3151f05b9e4 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumDefaultValue.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumDefaultValue.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnumDefaultValue
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumInteger.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumInteger.php
index 1239a82e12ee..ba9ae801cbdd 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumInteger.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumInteger.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnumInteger
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumIntegerDefaultValue.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumIntegerDefaultValue.php
index 32960269c03a..337698278084 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumIntegerDefaultValue.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterEnumIntegerDefaultValue.php
@@ -2,7 +2,7 @@
 /**
  * OuterEnumIntegerDefaultValue
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterObjectWithEnumProperty.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterObjectWithEnumProperty.php
index 2609a874dac6..58266bb0a708 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterObjectWithEnumProperty.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/OuterObjectWithEnumProperty.php
@@ -2,7 +2,7 @@
 /**
  * OuterObjectWithEnumProperty
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Pet.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Pet.php
index f7c49d9d88d0..5c53ca91889c 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Pet.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Pet.php
@@ -2,7 +2,7 @@
 /**
  * Pet
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ReadOnlyFirst.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ReadOnlyFirst.php
index 3cf0d460988a..170492659838 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ReadOnlyFirst.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/ReadOnlyFirst.php
@@ -2,7 +2,7 @@
 /**
  * ReadOnlyFirst
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SpecialModelName.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SpecialModelName.php
index ed92ba90ee15..551fd94cbf0e 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SpecialModelName.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/SpecialModelName.php
@@ -2,7 +2,7 @@
 /**
  * SpecialModelName
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Tag.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Tag.php
index 224c173a463a..5fd6e4917db6 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Tag.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/Tag.php
@@ -2,7 +2,7 @@
 /**
  * Tag
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/User.php b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/User.php
index 136134091710..f6d4a2661de5 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/Model/User.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/Model/User.php
@@ -2,7 +2,7 @@
 /**
  * User
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client
diff --git a/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php b/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
index 22d9ccbb26b4..c8be21f6cc20 100644
--- a/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
+++ b/samples/client/petstore/php/OpenAPIClient-php/lib/ObjectSerializer.php
@@ -2,7 +2,7 @@
 /**
  * ObjectSerializer
  *
- * PHP version 7.2
+ * PHP version 7.3
  *
  * @category Class
  * @package  OpenAPI\Client