yii\rbac\DbManager::getPermissionsByRole PHP Method

    public function getPermissionsByRole($roleName)
    {
        $childrenList = $this->getChildrenList();
        $result = [];
        $this->getChildrenRecursive($roleName, $childrenList, $result);
        if (empty($result)) {
            return [];
        }
        $query = (new Query())->from($this->itemTable)->where(['type' => Item::TYPE_PERMISSION, 'name' => array_keys($result)]);
        $permissions = [];
        foreach ($query->all($this->db) as $row) {
            $permissions[$row['name']] = $this->populateItem($row);
        }
        return $permissions;
    }

 /**
  * @param string $id
  *
  * @return string
  */
 public function actionView($id)
 {
     $role = $this->findModel($id);
     $authManager = new DbManager();
     $allRoles = Role::find()->asArray()->andWhere('name != :current_name', [':current_name' => $id])->all();
     $permissions = Permission::find()->andWhere(Yii::$app->getModule(\Yii::$app->user->moduleAliasName)->auth_item_table . '.name != :commonPermissionName', [':commonPermissionName' => Yii::$app->getModule(\Yii::$app->user->moduleAliasName)->commonPermissionName])->joinWith('group')->all();
     $permissionsByGroup = [];
     foreach ($permissions as $permission) {
         $permissionsByGroup[@$permission->group->name][] = $permission;
     }
     $childRoles = $authManager->getChildren($role->name);
     $currentRoutesAndPermissions = AuthHelper::separateRoutesAndPermissions($authManager->getPermissionsByRole($role->name));
     $currentPermissions = $currentRoutesAndPermissions->permissions;
     return $this->renderIsAjax('view', compact('role', 'allRoles', 'childRoles', 'currentPermissions', 'permissionsByGroup'));
 }