diff --git a/docs/guide/active-record.md b/docs/guide/active-record.md
index c54bb08027..6a3df6027b 100644
--- a/docs/guide/active-record.md
+++ b/docs/guide/active-record.md
@@ -172,7 +172,7 @@ Note that [[yii\db\ActiveRecord::updateAll()|updateAll()]], [[yii\db\ActiveRecor
 
 ```php
 // to insert a new customer record
-$customer = new Customer;
+$customer = new Customer();
 $customer->name = 'James';
 $customer->email = 'james@example.com';
 $customer->save();  // equivalent to $customer->insert();
@@ -634,7 +634,7 @@ order owned by the customer:
 
 ```php
 $customer = Customer::find(1);
-$order = new Order;
+$order = new Order();
 $order->subtotal = 100;
 $customer->link('orders', $order);
 ```
diff --git a/docs/guide/controller.md b/docs/guide/controller.md
index 8bf03adfd2..074a31683a 100644
--- a/docs/guide/controller.md
+++ b/docs/guide/controller.md
@@ -160,7 +160,7 @@ class BlogController extends Controller
 	{
 		$post = Post::find($id);
 		if (!$post) {
-			throw new NotFoundHttpException;
+			throw new NotFoundHttpException();
 		}
 
 		if (\Yii::$app->request->isPost) {
diff --git a/docs/guide/data-providers.md b/docs/guide/data-providers.md
index 4765fca5f7..9080c557c5 100644
--- a/docs/guide/data-providers.md
+++ b/docs/guide/data-providers.md
@@ -29,7 +29,7 @@ $posts = $provider->getModels();
 And the following example shows how to use ActiveDataProvider without ActiveRecord:
 
 ```php
-$query = new Query;
+$query = new Query();
 $provider = new ActiveDataProvider([
 	'query' => $query->from('tbl_post'),
 	'pagination' => [
@@ -62,7 +62,7 @@ because it needs to have [[allModels]] ready.
 ArrayDataProvider may be used in the following way:
 
 ```php
-$query = new Query;
+$query = new Query();
 $provider = new ArrayDataProvider([
     'allModels' => $query->from('tbl_post')->all(),
     'sort' => [
diff --git a/docs/guide/model.md b/docs/guide/model.md
index 666e499f3f..6585c674f2 100644
--- a/docs/guide/model.md
+++ b/docs/guide/model.md
@@ -24,7 +24,7 @@ be accessed like the member variables of any object. For example, a `Post` model
 may contain a `title` attribute and a `content` attribute, accessible as follows:
 
 ```php
-$post = new Post;
+$post = new Post();
 $post->title = 'Hello, world';
 $post->content = 'Something interesting is happening.';
 echo $post->title;
@@ -35,7 +35,7 @@ Since [[yii\base\Model|Model]] implements the [ArrayAccess](http://php.net/manua
 you can also access the attributes as if they were array elements:
 
 ```php
-$post = new Post;
+$post = new Post();
 $post['title'] = 'Hello, world';
 $post['content'] = 'Something interesting is happening';
 echo $post['title'];
@@ -160,7 +160,7 @@ class EmployeeController extends \yii\web\Controller
 		$employee = new Employee(['scenario' => 'managementPanel']);
 
 		// second way
-		$employee = new Employee;
+		$employee = new Employee();
 		$employee->scenario = 'managementPanel';
 
 		// third way
@@ -187,7 +187,7 @@ only, etc. If errors are found in validation, they may be presented to the user
 The following example shows how the validation is performed:
 
 ```php
-$model = new LoginForm;
+$model = new LoginForm();
 $model->username = $_POST['username'];
 $model->password = $_POST['password'];
 if ($model->validate()) {
diff --git a/docs/guide/query-builder.md b/docs/guide/query-builder.md
index c238639568..a2683118cb 100644
--- a/docs/guide/query-builder.md
+++ b/docs/guide/query-builder.md
@@ -9,7 +9,7 @@ The Query Builder provides an object-oriented vehicle for generating queries to
 A typical usage of the query builder looks like the following:
 
 ```php
-$rows = (new \yii\db\Query)
+$rows = (new \yii\db\Query())
 	->select('id, name')
 	->from('tbl_user')
 	->limit(10)
@@ -17,7 +17,7 @@ $rows = (new \yii\db\Query)
 
 // which is equivalent to the following code:
 
-$query = (new \yii\db\Query)
+$query = (new \yii\db\Query())
 	->select('id, name')
 	->from('tbl_user')
 	->limit(10);
@@ -116,7 +116,7 @@ You may specify a sub-query using a `Query` object. In this case, the correspond
 as the alias for the sub-query.
 
 ```php
-$subQuery = (new Query)->select('id')->from('tbl_user')->where('status=1');
+$subQuery = (new Query())->select('id')->from('tbl_user')->where('status=1');
 $query->select('*')->from(['u' => $subQuery]);
 ```
 
@@ -324,10 +324,10 @@ $query->leftJoin(['u' => $subQuery], 'u.id=author_id');
 In Yii in order to build it you can first form two query objects and then use `union` method:
 
 ```php
-$query = new Query;
+$query = new Query();
 $query->select("id, 'post' as type, name")->from('tbl_post')->limit(10);
 
-$anotherQuery = new Query;
+$anotherQuery = new Query();
 $anotherQuery->select('id, 'user' as type, name')->from('tbl_user')->limit(10);
 
 $query->union($anotherQuery);
@@ -347,7 +347,7 @@ Batch query can be used like the following:
 ```php
 use yii\db\Query;
 
-$query = (new Query)
+$query = (new Query())
 	->from('tbl_user')
 	->orderBy('id');
 
@@ -376,7 +376,7 @@ will still keep the proper index. For example,
 ```php
 use yii\db\Query;
 
-$query = (new Query)
+$query = (new Query())
 	->from('tbl_user')
 	->indexBy('username');
 
diff --git a/docs/guide/upgrade-from-v1.md b/docs/guide/upgrade-from-v1.md
index 03a5b21cc7..92dc8680d8 100644
--- a/docs/guide/upgrade-from-v1.md
+++ b/docs/guide/upgrade-from-v1.md
@@ -158,7 +158,7 @@ in controllers or widgets:
 ```php
 $content = Yii::$app->view->renderFile($viewFile, $params);
 // You can also explicitly create a new View instance to do the rendering
-// $view = new View;
+// $view = new View();
 // $view->renderFile($viewFile, $params);
 ```
 
@@ -186,7 +186,7 @@ New methods called [[yii\base\Model::load()|load()] and [[yii\base\Model::loadMu
 introduced to simplify the data population from user inputs to a model. For example,
 
 ```php
-$model = new Post;
+$model = new Post();
 if ($model->load($_POST)) {...}
 // which is equivalent to:
 if (isset($_POST['Post'])) {
@@ -394,7 +394,7 @@ In 1.1, query building is scattered among several classes, including `CDbCommand
 and [[yii\db\QueryBuilder|QueryBuilder]] to generate SQL statements from query objects. For example:
 
 ```php
-$query = new \yii\db\Query;
+$query = new \yii\db\Query();
 $query->select('id, name')
       ->from('tbl_user')
       ->limit(10);