diff --git a/samples/server/petstore/php-slim4/lib/Model/InlineObject.php b/samples/server/petstore/php-slim4/lib/Model/InlineObject.php
new file mode 100644
index 00000000000..723616e8df4
--- /dev/null
+++ b/samples/server/petstore/php-slim4/lib/Model/InlineObject.php
@@ -0,0 +1,63 @@
+<?php
+
+/**
+ * InlineObject
+ *
+ * PHP version 7.1
+ *
+ * @package OpenAPIServer\Model
+ * @author  OpenAPI Generator team
+ * @link    https://github.com/openapitools/openapi-generator
+ */
+
+/**
+ * NOTE: This class is auto generated by the openapi generator program.
+ * https://github.com/openapitools/openapi-generator
+ */
+namespace OpenAPIServer\Model;
+
+use OpenAPIServer\Interfaces\ModelInterface;
+
+/**
+ * InlineObject
+ *
+ * @package OpenAPIServer\Model
+ * @author  OpenAPI Generator team
+ * @link    https://github.com/openapitools/openapi-generator
+ */
+class InlineObject implements ModelInterface
+{
+    private const MODEL_SCHEMA = <<<'SCHEMA'
+{
+  "type" : "object",
+  "properties" : {
+    "name" : {
+      "type" : "string",
+      "description" : "Updated name of the pet"
+    },
+    "status" : {
+      "type" : "string",
+      "description" : "Updated status of the pet"
+    }
+  }
+}
+SCHEMA;
+
+    /** @var string $name Updated name of the pet*/
+    private $name;
+
+    /** @var string $status Updated status of the pet*/
+    private $status;
+
+    /**
+     * Returns model schema.
+     *
+     * @param bool $assoc When TRUE, returned objects will be converted into associative arrays. Default FALSE.
+     *
+     * @return array
+     */
+    public static function getOpenApiSchema($assoc = false)
+    {
+        return json_decode(static::MODEL_SCHEMA, $assoc);
+    }
+}
diff --git a/samples/server/petstore/php-slim4/lib/Model/InlineObject1.php b/samples/server/petstore/php-slim4/lib/Model/InlineObject1.php
new file mode 100644
index 00000000000..87cb07a3865
--- /dev/null
+++ b/samples/server/petstore/php-slim4/lib/Model/InlineObject1.php
@@ -0,0 +1,64 @@
+<?php
+
+/**
+ * InlineObject1
+ *
+ * PHP version 7.1
+ *
+ * @package OpenAPIServer\Model
+ * @author  OpenAPI Generator team
+ * @link    https://github.com/openapitools/openapi-generator
+ */
+
+/**
+ * NOTE: This class is auto generated by the openapi generator program.
+ * https://github.com/openapitools/openapi-generator
+ */
+namespace OpenAPIServer\Model;
+
+use OpenAPIServer\Interfaces\ModelInterface;
+
+/**
+ * InlineObject1
+ *
+ * @package OpenAPIServer\Model
+ * @author  OpenAPI Generator team
+ * @link    https://github.com/openapitools/openapi-generator
+ */
+class InlineObject1 implements ModelInterface
+{
+    private const MODEL_SCHEMA = <<<'SCHEMA'
+{
+  "type" : "object",
+  "properties" : {
+    "additionalMetadata" : {
+      "type" : "string",
+      "description" : "Additional data to pass to server"
+    },
+    "file" : {
+      "type" : "string",
+      "description" : "file to upload",
+      "format" : "binary"
+    }
+  }
+}
+SCHEMA;
+
+    /** @var string $additionalMetadata Additional data to pass to server*/
+    private $additionalMetadata;
+
+    /** @var \SplFileObject $file file to upload*/
+    private $file;
+
+    /**
+     * Returns model schema.
+     *
+     * @param bool $assoc When TRUE, returned objects will be converted into associative arrays. Default FALSE.
+     *
+     * @return array
+     */
+    public static function getOpenApiSchema($assoc = false)
+    {
+        return json_decode(static::MODEL_SCHEMA, $assoc);
+    }
+}
diff --git a/samples/server/petstore/php-slim4/test/Model/InlineObject1Test.php b/samples/server/petstore/php-slim4/test/Model/InlineObject1Test.php
new file mode 100644
index 00000000000..9f47cf77f6a
--- /dev/null
+++ b/samples/server/petstore/php-slim4/test/Model/InlineObject1Test.php
@@ -0,0 +1,104 @@
+<?php
+
+/**
+ * InlineObject1Test
+ *
+ * PHP version 7.1
+ *
+ * @package OpenAPIServer\Model
+ * @author  OpenAPI Generator team
+ * @link    https://github.com/openapitools/openapi-generator
+ */
+
+/**
+ * OpenAPI Petstore
+ *
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ * The version of the OpenAPI document: 1.0.0
+ * Generated by: https://github.com/openapitools/openapi-generator.git
+ */
+
+/**
+ * NOTE: This class is auto generated by the openapi generator program.
+ * https://github.com/openapitools/openapi-generator
+ * Please update the test case below to test the model.
+ */
+namespace OpenAPIServer\Model;
+
+use PHPUnit\Framework\TestCase;
+use OpenAPIServer\Model\InlineObject1;
+
+/**
+ * InlineObject1Test Class Doc Comment
+ *
+ * @package OpenAPIServer\Model
+ * @author  OpenAPI Generator team
+ * @link    https://github.com/openapitools/openapi-generator
+ *
+ * @coversDefaultClass \OpenAPIServer\Model\InlineObject1
+ */
+class InlineObject1Test extends TestCase
+{
+
+    /**
+     * Setup before running any test cases
+     */
+    public static function setUpBeforeClass()
+    {
+    }
+
+    /**
+     * Setup before running each test case
+     */
+    public function setUp()
+    {
+    }
+
+    /**
+     * Clean up after running each test case
+     */
+    public function tearDown()
+    {
+    }
+
+    /**
+     * Clean up after running all test cases
+     */
+    public static function tearDownAfterClass()
+    {
+    }
+
+    /**
+     * Test "InlineObject1"
+     */
+    public function testInlineObject1()
+    {
+        $testInlineObject1 = new InlineObject1();
+    }
+
+    /**
+     * Test attribute "additionalMetadata"
+     */
+    public function testPropertyAdditionalMetadata()
+    {
+    }
+
+    /**
+     * Test attribute "file"
+     */
+    public function testPropertyFile()
+    {
+    }
+
+    /**
+     * Test getOpenApiSchema static method
+     * @covers ::getOpenApiSchema
+     */
+    public function testGetOpenApiSchema()
+    {
+        $schemaObject = InlineObject1::getOpenApiSchema();
+        $schemaArr = InlineObject1::getOpenApiSchema(true);
+        $this->assertIsObject($schemaObject);
+        $this->assertIsArray($schemaArr);
+    }
+}
diff --git a/samples/server/petstore/php-slim4/test/Model/InlineObjectTest.php b/samples/server/petstore/php-slim4/test/Model/InlineObjectTest.php
new file mode 100644
index 00000000000..46716da936d
--- /dev/null
+++ b/samples/server/petstore/php-slim4/test/Model/InlineObjectTest.php
@@ -0,0 +1,104 @@
+<?php
+
+/**
+ * InlineObjectTest
+ *
+ * PHP version 7.1
+ *
+ * @package OpenAPIServer\Model
+ * @author  OpenAPI Generator team
+ * @link    https://github.com/openapitools/openapi-generator
+ */
+
+/**
+ * OpenAPI Petstore
+ *
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ * The version of the OpenAPI document: 1.0.0
+ * Generated by: https://github.com/openapitools/openapi-generator.git
+ */
+
+/**
+ * NOTE: This class is auto generated by the openapi generator program.
+ * https://github.com/openapitools/openapi-generator
+ * Please update the test case below to test the model.
+ */
+namespace OpenAPIServer\Model;
+
+use PHPUnit\Framework\TestCase;
+use OpenAPIServer\Model\InlineObject;
+
+/**
+ * InlineObjectTest Class Doc Comment
+ *
+ * @package OpenAPIServer\Model
+ * @author  OpenAPI Generator team
+ * @link    https://github.com/openapitools/openapi-generator
+ *
+ * @coversDefaultClass \OpenAPIServer\Model\InlineObject
+ */
+class InlineObjectTest extends TestCase
+{
+
+    /**
+     * Setup before running any test cases
+     */
+    public static function setUpBeforeClass()
+    {
+    }
+
+    /**
+     * Setup before running each test case
+     */
+    public function setUp()
+    {
+    }
+
+    /**
+     * Clean up after running each test case
+     */
+    public function tearDown()
+    {
+    }
+
+    /**
+     * Clean up after running all test cases
+     */
+    public static function tearDownAfterClass()
+    {
+    }
+
+    /**
+     * Test "InlineObject"
+     */
+    public function testInlineObject()
+    {
+        $testInlineObject = new InlineObject();
+    }
+
+    /**
+     * Test attribute "name"
+     */
+    public function testPropertyName()
+    {
+    }
+
+    /**
+     * Test attribute "status"
+     */
+    public function testPropertyStatus()
+    {
+    }
+
+    /**
+     * Test getOpenApiSchema static method
+     * @covers ::getOpenApiSchema
+     */
+    public function testGetOpenApiSchema()
+    {
+        $schemaObject = InlineObject::getOpenApiSchema();
+        $schemaArr = InlineObject::getOpenApiSchema(true);
+        $this->assertIsObject($schemaObject);
+        $this->assertIsArray($schemaArr);
+    }
+}