[PHP] Fix: Type object not handled properly in setParameterExampleValue (#6619)

* Add test which reproduce the warning #5338

https://github.com/swagger-api/swagger-codegen/issues/5338#issuecomment-292502895
`[main] WARN io.swagger.codegen.languages.PhpClientCodegen - Type object not handled properly in setParameterExampleValue`

* Fix Type object not handled properly in setParameterExampleValue

* Update samples

- /bin/php-petstore.sh
- /bin/security/php-petstore.sh

modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PhpClientCodegen.java

@@ -627,6 +627,8 @@ public class PhpClientCodegen extends DefaultCodegen implements CodegenConfig {
                 example = "2013-10-20T19:20:30+01:00";
             }
             example = "new \\DateTime(\"" + escapeText(example) + "\")";
+        } else if ("object".equals(type)) {
+            example = "new \\stdClass";
         } else if (!languageSpecificPrimitives.contains(type)) {
             // type is a model class, e.g. User
             example = "new " + getTypeDeclaration(type) + "()";

modules/swagger-codegen/src/test/java/io/swagger/codegen/php/PhpClientExampleTest.java

@@ -0,0 +1,19 @@
+package io.swagger.codegen.php;
+
+import io.swagger.codegen.CodegenParameter;
+import io.swagger.codegen.languages.PhpClientCodegen;
+
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+public class PhpClientExampleTest {
+    @Test(description = "sets example value")
+    public void exampleValueTest() {
+        PhpClientCodegen clientCodegen = new PhpClientCodegen();
+        CodegenParameter p = new CodegenParameter();
+        p.baseType = "object";
+
+        clientCodegen.setParameterExampleValue(p);
+        Assert.assertEquals(p.example, "new \\stdClass");
+    }
+}

samples/client/petstore-security-test/php/SwaggerClient-php/lib/Model/ModelInterface.php

@@ -18,7 +18,6 @@
  * OpenAPI spec version: 1.0.0 *_/ ' \" =end -- \\r\\n \\n \\r
  * Contact: apiteam@swagger.io *_/ ' \" =end -- \\r\\n \\n \\r
  * Generated by: https://github.com/swagger-api/swagger-codegen.git
- *
  */
 
 /**

samples/client/petstore-security-test/php/SwaggerClient-php/lib/ObjectSerializer.php

@@ -64,7 +64,9 @@ class ObjectSerializer
             foreach ($data::swaggerTypes() as $property => $swaggerType) {
                 $getter = $data::getters()[$property];
                 $value = $data->$getter();
-                if ($value !== null && method_exists($swaggerType, 'getAllowableEnumValues')
+                if ($value !== null
+                    && !in_array($swaggerType, ['DateTime', 'bool', 'boolean', 'byte', 'double', 'float', 'int', 'integer', 'mixed', 'number', 'object', 'string', 'void'], true)
+                    && method_exists($swaggerType, 'getAllowableEnumValues')
                     && !in_array($value, $swaggerType::getAllowableEnumValues())) {
                     $imploded = implode("', '", $swaggerType::getAllowableEnumValues());
                     throw new \InvalidArgumentException("Invalid value for enum '$swaggerType', must be one of: '$imploded'");