将用户标识作为参数传递

I am trying to pass the id of the user who is logged in as a parameter to the index.

 <li class="active"><a href="<?php echo Yii::$app->request->baseUrl;?>/todo/index/"><span class="glyphicon glyphicon-home"></span> Home</a></li>

here i want to add the user id who is logged in:

what i have tried to fail:

 <li class="active"><a href="<?php echo Yii::$app->request->baseUrl;?>/todo/index/. Yii::$app->user->identity->username ."><span class="glyphicon glyphicon-home"></span> Home</a></li>

You can do like this

<li class="active">
    <a href="<?php echo Yii::$app->request->baseUrl.'/todo/index/'.Yii::$app->user->identity->username;?>">
        <span class="glyphicon glyphicon-home"></span> Home
    </a>
</li>

Try this:

<?= Html::a('<i class="glyphicon glyphicon-home">Home', Url::to(['todo/index', 'user_id' => Yii::$app->user->id]), ['class' => 'btn btn-default']) ?>

Accepted answer is great but you should use:

<a href="<?= Yii::$app->urlManager->createAbsoluteUrl(array("todo/index", "uname" => Yii::$app->user->identity->username)); ?>">

It is not a good practice too write the SEF url directly. You should format it using rules.