diff --git a/backend/modules/content/controllers/ArticleController.php b/backend/modules/content/controllers/ArticleController.php
index 5940e37ab..37b6591e9 100644
--- a/backend/modules/content/controllers/ArticleController.php
+++ b/backend/modules/content/controllers/ArticleController.php
@@ -77,12 +77,11 @@ public function actionUpdate($id)
 
         if ($article->load(Yii::$app->request->post()) && $article->save()) {
             return $this->redirect(['index']);
-        } else {
-            return $this->render('update', [
-                'model' => $article,
-                'categories' => ArticleCategory::find()->active()->all(),
-            ]);
         }
+        return $this->render('update', [
+            'model' => $article,
+            'categories' => ArticleCategory::find()->active()->all(),
+        ]);
     }
 
     /**
@@ -107,9 +106,9 @@ protected function findModel($id)
     {
         if (($model = Article::findOne($id)) !== null) {
             return $model;
-        } else {
-            throw new NotFoundHttpException('The requested page does not exist.');
         }
+        throw new NotFoundHttpException('The requested page does not exist.');
+
     }
 
 }
diff --git a/backend/modules/content/controllers/CategoryController.php b/backend/modules/content/controllers/CategoryController.php
index 72ea7b223..306e205ab 100644
--- a/backend/modules/content/controllers/CategoryController.php
+++ b/backend/modules/content/controllers/CategoryController.php
@@ -39,20 +39,19 @@ public function actionIndex()
 
         if ($category->load(Yii::$app->request->post()) && $category->save()) {
             return $this->redirect(['index']);
-        } else {
-            $searchModel = new ArticleCategorySearch();
-            $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
-
-            $categories = ArticleCategory::find()->noParents()->all();
-            $categories = ArrayHelper::map($categories, 'id', 'title');
-
-            return $this->render('index', [
-                'searchModel' => $searchModel,
-                'dataProvider' => $dataProvider,
-                'model' => $category,
-                'categories' => $categories,
-            ]);
         }
+        $searchModel = new ArticleCategorySearch();
+        $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
+
+        $categories = ArticleCategory::find()->noParents()->all();
+        $categories = ArrayHelper::map($categories, 'id', 'title');
+
+        return $this->render('index', [
+            'searchModel' => $searchModel,
+            'dataProvider' => $dataProvider,
+            'model' => $category,
+            'categories' => $categories,
+        ]);
     }
 
     /**
@@ -68,15 +67,14 @@ public function actionUpdate($id)
 
         if ($category->load(Yii::$app->request->post()) && $category->save()) {
             return $this->redirect(['index']);
-        } else {
-            $categories = ArticleCategory::find()->noParents()->andWhere(['not', ['id' => $id]])->all();
-            $categories = ArrayHelper::map($categories, 'id', 'title');
-
-            return $this->render('update', [
-                'model' => $category,
-                'categories' => $categories,
-            ]);
         }
+        $categories = ArticleCategory::find()->noParents()->andWhere(['not', ['id' => $id]])->all();
+        $categories = ArrayHelper::map($categories, 'id', 'title');
+
+        return $this->render('update', [
+            'model' => $category,
+            'categories' => $categories,
+        ]);
     }
 
     /**
@@ -101,8 +99,7 @@ protected function findModel($id)
     {
         if (($model = ArticleCategory::findOne($id)) !== null) {
             return $model;
-        } else {
-            throw new NotFoundHttpException('The requested page does not exist.');
         }
+        throw new NotFoundHttpException('The requested page does not exist.');
     }
 }
diff --git a/backend/modules/content/controllers/PageController.php b/backend/modules/content/controllers/PageController.php
index 2091d43a0..eaf523bd2 100755
--- a/backend/modules/content/controllers/PageController.php
+++ b/backend/modules/content/controllers/PageController.php
@@ -38,16 +38,15 @@ public function actionIndex()
 
         if ($page->load(Yii::$app->request->post()) && $page->save()) {
             return $this->redirect(['index']);
-        } else {
-            $searchModel = new PageSearch();
-            $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
-
-            return $this->render('index', [
-                'searchModel' => $searchModel,
-                'dataProvider' => $dataProvider,
-                'model' => $page,
-            ]);
         }
+        $searchModel = new PageSearch();
+        $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
+
+        return $this->render('index', [
+            'searchModel' => $searchModel,
+            'dataProvider' => $dataProvider,
+            'model' => $page,
+        ]);
     }
 
     /**
@@ -61,11 +60,10 @@ public function actionCreate()
 
         if ($page->load(Yii::$app->request->post()) && $page->save()) {
             return $this->redirect(['index']);
-        } else {
-            return $this->render('create', [
-                'model' => $page,
-            ]);
         }
+        return $this->render('create', [
+            'model' => $page,
+        ]);
     }
 
     /**
@@ -110,8 +108,7 @@ protected function findModel($id)
     {
         if (($model = Page::findOne($id)) !== null) {
             return $model;
-        } else {
-            throw new NotFoundHttpException('The requested page does not exist.');
         }
+        throw new NotFoundHttpException('The requested page does not exist.');
     }
 }
diff --git a/backend/modules/content/views/category/update.php b/backend/modules/content/views/category/update.php
index 970346525..91b0ad435 100644
--- a/backend/modules/content/views/category/update.php
+++ b/backend/modules/content/views/category/update.php
@@ -11,7 +11,6 @@
     ]) . ' ' . $model->title;
 
 $this->params['breadcrumbs'][] = ['label' => Yii::t('backend', 'Article Categories'), 'url' => ['index']];
-$this->params['breadcrumbs'][] = ['label' => $model->title, 'url' => ['view', 'id' => $model->id]];
 $this->params['breadcrumbs'][] = Yii::t('backend', 'Update');
 
 ?>
diff --git a/backend/views/_gii/templates/controller.php b/backend/views/_gii/templates/controller.php
index 6a746b464..10a215a2b 100644
--- a/backend/views/_gii/templates/controller.php
+++ b/backend/views/_gii/templates/controller.php
@@ -107,11 +107,10 @@ public function actionCreate()
 
         if ($model->load(Yii::$app->request->post()) && $model->save()) {
             return $this->redirect(['view', <?php echo $urlParams ?>]);
-        } else {
-            return $this->render('create', [
-                'model' => $model,
-            ]);
         }
+        return $this->render('create', [
+            'model' => $model,
+        ]);
     }
 
     /**
@@ -126,11 +125,10 @@ public function actionUpdate(<?php echo $actionParams ?>)
 
         if ($model->load(Yii::$app->request->post()) && $model->save()) {
             return $this->redirect(['view', <?php echo $urlParams ?>]);
-        } else {
-            return $this->render('update', [
-                'model' => $model,
-            ]);
         }
+        return $this->render('update', [
+            'model' => $model,
+        ]);
     }
 
     /**
@@ -168,8 +166,7 @@ protected function findModel(<?php echo $actionParams ?>)
 ?>
         if (($model = <?php echo $modelClass ?>::findOne(<?php echo $condition ?>)) !== null) {
             return $model;
-        } else {
-            throw new NotFoundHttpException('The requested page does not exist.');
         }
+        throw new NotFoundHttpException('The requested page does not exist.');
     }
 }
diff --git a/backend/views/layouts/base.php b/backend/views/layouts/base.php
index 2858022c6..ee7f889ab 100755
--- a/backend/views/layouts/base.php
+++ b/backend/views/layouts/base.php
@@ -8,9 +8,7 @@
 
 $bundle = BackendAsset::register($this);
 
-$this->params['body-class'] = array_key_exists('body-class', $this->params) ?
-    $this->params['body-class']
-    : null;
+$this->params['body-class'] = $this->params['body-class'] ?? null;
 ?>
 
 <?php $this->beginPage() ?>
@@ -39,4 +37,4 @@
     <?php $this->endBody() ?>
 <?php echo Html::endTag('body') ?>
 </html>
-<?php $this->endPage() ?>
\ No newline at end of file
+<?php $this->endPage() ?>
diff --git a/backend/views/layouts/clear.php b/backend/views/layouts/clear.php
index 3fd13d7a9..9bda1bd77 100755
--- a/backend/views/layouts/clear.php
+++ b/backend/views/layouts/clear.php
@@ -1,8 +1,9 @@
 <?php
 /**
  * @var $this yii\web\View
+ * @var $content string
  */
 ?>
 <?php $this->beginContent('@backend/views/layouts/common.php'); ?>
     <?php echo $content ?>
-<?php $this->endContent(); ?>
\ No newline at end of file
+<?php $this->endContent(); ?>
diff --git a/backend/views/layouts/common.php b/backend/views/layouts/common.php
index ab2683964..2d28e0643 100644
--- a/backend/views/layouts/common.php
+++ b/backend/views/layouts/common.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * @var $this    yii\web\View
+ * @var $this yii\web\View
  * @var $content string
  */
 
@@ -154,7 +154,7 @@ class="img-circle"/>
                         'label' => Yii::t('backend', 'Users'),
                         'icon' => '<i class="fa fa-users"></i>',
                         'url' => ['/user/index'],
-                        'active' => (Yii::$app->controller->id == 'user'),
+                        'active' => Yii::$app->controller->id === 'user',
                         'visible' => Yii::$app->user->can('administrator'),
                     ],
                     [
@@ -165,26 +165,27 @@ class="img-circle"/>
                         'label' => Yii::t('backend', 'Static pages'),
                         'url' => ['/content/page/index'],
                         'icon' => '<i class="fa fa-thumb-tack"></i>',
-                        'active' => (Yii::$app->controller->id == 'page'),
+                        'active' => Yii::$app->controller->id === 'page',
                     ],
                     [
                         'label' => Yii::t('backend', 'Articles'),
                         'url' => '#',
                         'icon' => '<i class="fa fa-files-o"></i>',
                         'options' => ['class' => 'treeview'],
-                        'active' => (Yii::$app->controller->module->id == 'article'),
+                        'active' => 'content' === Yii::$app->controller->module->id &&
+                            ('article' === Yii::$app->controller->id || 'category' === Yii::$app->controller->id),
                         'items' => [
                             [
                                 'label' => Yii::t('backend', 'Articles'),
                                 'url' => ['/content/article/index'],
                                 'icon' => '<i class="fa fa-file-o"></i>',
-                                'active' => (Yii::$app->controller->id == 'default'),
+                                'active' => Yii::$app->controller->id === 'article',
                             ],
                             [
                                 'label' => Yii::t('backend', 'Categories'),
                                 'url' => ['/content/category/index'],
                                 'icon' => '<i class="fa fa-folder-open-o"></i>',
-                                'active' => (Yii::$app->controller->id == 'category'),
+                                'active' => Yii::$app->controller->id === 'category',
                             ],
                         ],
                     ],
@@ -193,19 +194,19 @@ class="img-circle"/>
                         'url' => '#',
                         'icon' => '<i class="fa fa-code"></i>',
                         'options' => ['class' => 'treeview'],
-                        'active' => (Yii::$app->controller->module->id == 'widget'),
+                        'active' => Yii::$app->controller->module->id === 'widget',
                         'items' => [
                             [
                                 'label' => Yii::t('backend', 'Text Blocks'),
                                 'url' => ['/widget/text/index'],
                                 'icon' => '<i class="fa fa-circle-o"></i>',
-                                'active' => (Yii::$app->controller->id == 'text'),
+                                'active' => Yii::$app->controller->id === 'text',
                             ],
                             [
                                 'label' => Yii::t('backend', 'Menu'),
                                 'url' => ['/widget/menu/index'],
                                 'icon' => '<i class="fa fa-circle-o"></i>',
-                                'active' => (Yii::$app->controller->id == 'menu'),
+                                'active' => Yii::$app->controller->id === 'menu',
                             ],
                             [
                                 'label' => Yii::t('backend', 'Carousel'),
diff --git a/backend/views/layouts/main.php b/backend/views/layouts/main.php
index c10940db8..950ab2d4c 100755
--- a/backend/views/layouts/main.php
+++ b/backend/views/layouts/main.php
@@ -1,6 +1,7 @@
 <?php
 /**
  * @var $this yii\web\View
+ * @var $content string
  */
 ?>
 <?php $this->beginContent('@backend/views/layouts/common.php'); ?>
@@ -9,4 +10,4 @@
             <?php echo $content ?>
         </div>
     </div>
-<?php $this->endContent(); ?>
\ No newline at end of file
+<?php $this->endContent(); ?>