test1/public/basic/views/site/about.php

<?php

/* @var $this yii\web\View */

use yii\helpers\Html;
use yii\widgets\Breadcrumbs;

$this->title = 'About';
$this->params['breadcrumbs'][] = $this->title;
?>
<div class="site-about custom-block">
    <?= Breadcrumbs::widget([
        'links' => isset($this->params['breadcrumbs']) ? $this->params['breadcrumbs'] : [],
    ]) ?>
    <h1><?= Html::encode($this->title) ?></h1>

    <p> <?= $_SERVER['REMOTE_ADDR'] ?>
        This is the About page. You may modify the following file to customize its content:
    </p>

    <code><?= __FILE__ ?></code>
</div>