add __toString and update php sample

modules/swagger-codegen/src/main/resources/php/model.mustache

@@ -65,6 +65,14 @@ class {{classname}} implements ArrayAccess {
   public function offsetUnset($offset) {
     unset($this->$offset);
   }
+
+  public function __toString() {
+    if (defined('JSON_PRETTY_PRINT')) {
+      return json_encode($this, JSON_PRETTY_PRINT);
+    } else {
+      return json_encode($this);
+    }
+  }
 }
 {{/model}}
 {{/models}}

samples/client/petstore/php/SwaggerClient-php/lib/models/Category.php

@@ -61,4 +61,12 @@ class Category implements ArrayAccess {
   public function offsetUnset($offset) {
     unset($this->$offset);
   }
+
+  public function __toString() {
+    if (defined('JSON_PRETTY_PRINT')) {
+      return json_encode($this, JSON_PRETTY_PRINT);
+    } else {
+      return json_encode($this);
+    }
+  }
 }

samples/client/petstore/php/SwaggerClient-php/lib/models/Order.php

@@ -80,4 +80,12 @@ class Order implements ArrayAccess {
   public function offsetUnset($offset) {
     unset($this->$offset);
   }
+
+  public function __toString() {
+    if (defined('JSON_PRETTY_PRINT')) {
+      return json_encode($this, JSON_PRETTY_PRINT);
+    } else {
+      return json_encode($this);
+    }
+  }
 }

samples/client/petstore/php/SwaggerClient-php/lib/models/Pet.php

@@ -80,4 +80,12 @@ class Pet implements ArrayAccess {
   public function offsetUnset($offset) {
     unset($this->$offset);
   }
+
+  public function __toString() {
+    if (defined('JSON_PRETTY_PRINT')) {
+      return json_encode($this, JSON_PRETTY_PRINT);
+    } else {
+      return json_encode($this);
+    }
+  }
 }

samples/client/petstore/php/SwaggerClient-php/lib/models/Tag.php

@@ -61,4 +61,12 @@ class Tag implements ArrayAccess {
   public function offsetUnset($offset) {
     unset($this->$offset);
   }
+
+  public function __toString() {
+    if (defined('JSON_PRETTY_PRINT')) {
+      return json_encode($this, JSON_PRETTY_PRINT);
+    } else {
+      return json_encode($this);
+    }
+  }
 }

samples/client/petstore/php/SwaggerClient-php/lib/models/User.php

@@ -88,4 +88,12 @@ class User implements ArrayAccess {
   public function offsetUnset($offset) {
     unset($this->$offset);
   }
+
+  public function __toString() {
+    if (defined('JSON_PRETTY_PRINT')) {
+      return json_encode($this, JSON_PRETTY_PRINT);
+    } else {
+      return json_encode($this);
+    }
+  }
 }

samples/client/petstore/php/SwaggerClient-php/tests/PetApiTest.php

@@ -10,6 +10,9 @@ class PetApiTest extends \PHPUnit_Framework_TestCase
     // for error reporting (need to run with php5.3 to get no warning)
     //ini_set('display_errors', 1);
     //error_reporting(~0);
+    ini_set('display_startup_errors',1);
+    ini_set('display_errors',1);
+    error_reporting(-1);
 
     // enable debugging 
     //SwaggerClient\Configuration::$debug = true;

samples/client/petstore/php/test.php

@@ -23,7 +23,8 @@ try {
     $pet_api->getApiClient()->addDefaultHeader("TEST_API_KEY", "09182sdkanafndsl903");
     // return Pet (model)
     $response = $pet_api->getPetById($petId);
-    var_dump($response);
+    // to test __toString()
+    print ($response);
 
     // add pet (post json)
     $new_pet_id = 10005;