Souke/backend/views/etablissement/update.php

<?php

use yii\helpers\Html;
use yii\widgets\ActiveForm;

/* @var $this yii\web\View */
/* @var $model common\models\User */

$this->title = 'Paramètres';
$this->params['breadcrumbs'][] = 'Paramètres';
?>
<div class="user-update">

    <h1><?= Html::encode($this->title) ?></h1>

    <div class="user-form">
        <?php $form = ActiveForm::begin(); ?>
        <div class="">
            <?= $form->field($model, 'code_postal') ?>
            <?= $form->field($model, 'ville') ?>
            <?php //$form->field($model, 'description')->textarea(['rows' => 10]) ?>
            <?= $form->field($model, 'photo')->fileInput() ?>
            <?php
            if (strlen($model->photo)) {
                
                if(Yii::$app->getRequest()->serverName == 'localhost')
                    $base_url = '../../frontend/web/' ;
                else 
                    $base_url = 'http://www.laboiteapain.net/' ;
                
                echo '<img src="'.$base_url.'uploads/' . $model->photo . '" width="400px" /><br />';
                echo '<input type="checkbox" name="delete_photo" id="delete_photo" /> <label for="delete_photo">Supprimer la photo</label><br /><br />';
            }
            ?>
            <div class="form-group">
                <?= Html::submitButton('Mettre à jour', ['class' => $model->isNewRecord ? 'btn btn-success' : 'btn btn-primary']) ?>
            </div>
        </div>
        <?php ActiveForm::end(); ?>
    </div>

</div>