Souke/backend/views/user/index.php

<?php

use yii\helpers\Html;
use yii\grid\GridView;
use common\models\User ;

/* @var $this yii\web\View */
/* @var $dataProvider yii\data\ActiveDataProvider */

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

    <h1>
        <?= Html::encode($this->title) ?> 
        <?= Html::a('Ajouter', ['create'], ['class' => 'btn btn-primary']) ?>
        <?= Html::a('<span class="glyphicon glyphicon-envelope"></span> Liste des emails', ['mail'], ['class' => 'btn btn-default']) ?>
    </h1>
    
    <?= GridView::widget([
        'dataProvider' => $dataProvider,
        'columns' => [
            'nom',
            'prenom',
            'telephone',
            'email',
            [
                'attribute' => 'credit',
                'format' => 'raw',
                'value' => function($model) use($etablissement) {
                        $html = '<div class="input-group">
                            <input type="text" class="form-control input-credit" readonly="readonly" value="'.number_format($model['credit'],2).' €" placeholder="">
                            <span class="input-group-btn">
                              '.Html::a(
                                '<span class="glyphicon glyphicon-euro"></span> Crédit',
                                Yii::$app->urlManager->createUrl(['user/credit','id' => $model['id']]),
                                [
                                    'title' => 'Crédit', 
                                    'class' => 'btn btn-default'
                                ]
                            ).'
                            </span>
                          </div>' ;
                    return $html ;
                }
            ], 
            [
                'class' => 'yii\grid\ActionColumn',
                'template' => '{update}',
                'headerOptions' => ['class' => 'actions'],
                'buttons' => [
                    'update' => function ($url, $model) {
                        $url = Yii::$app->urlManager->createUrl(['user/update','id' => $model['id']]) ;
                        $user = User::find()->with('userEtablissement')->where(['id' => $model['id']])->one() ;
                        if(count($user->userEtablissement) <= 1)
                        {
                            return Html::a('<span class="glyphicon glyphicon-pencil"></span> Modifier', $url, [
                                        'title' => Yii::t('app', 'Modifier'), 'class' => 'btn btn-default'
                            ]);
                        }
                        else {
                            return '<span data-toggle="tooltip" data-placement="top" title="Vous ne pouvez pas modifier les utilisateurs qui appartiennent à plusieurs boulangeries."><span class="glyphicon glyphicon-remove-sign"></span> Non modifiable</span>' ;
                        }
                    },
                ],
            ],
        ],
    ]); ?>

</div>