站里导航的头像是怎么加到NavBar里的 [ 2.0 版本 ]

<nav class="navbar navbar-static-top" role="navigation">

        <a href="#" class="sidebar-toggle" data-toggle="offcanvas" role="button">
            <span class="sr-only">Toggle navigation</span>
        </a>

        <div class="navbar-custom-menu">

            <ul class="nav navbar-nav">

               <li class="dropdown user user-menu">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">
                        <img src="<?= Yii::$app->user->getAvatar()?>" class="user-image" alt="User Image"/>
                    </a>
                    <ul class="dropdown-menu">
                       <li class="user-header">
                           ....
                        </li>
                        <li class="user-footer">
                           ....
                        </li>
                    </ul>
                </li>

                <li>
                    <a href="#" data-toggle="control-sidebar"><i class="fa fa-gears"></i></a>
                </li>
            </ul>
        </div>
 </nav>

大概就是这样了