loop notif

<?php appHeader(1, $page); ?>
<div id="appCapsule">
    <?php
    $notify = DB("SELECT * FROM users_notification WHERE uid = '$user_id' ORDER BY created_at DESC");
    $created_at = '';
    $yesterday  = date('Y-m-d', strtotime("-1 day", strtotime(date('Y-m-d'))));
    while($data_notify = $notify->fetch_assoc()) {
        $tgl_db=date('Y-m-d',strtotime($data_notify['created_at']));
        if($created_at!=$tgl_db){
            if(date('Y-m-d')==$tgl_db){
               $waktu='Hari ini';
            }else if($yesterday==$tgl_db){
               $waktu='Kemarin';
            } else {
                $waktu=str_replace(substr(format_date('id', $created_at), -5), '', format_date('id', $created_at));
            }
            $created_at=$tgl_db;
    ?>
    <div class="section pt-2 pb-1">
        <div class="text-secondary" style="font-weight: bold"><?= $waktu; ?></div>
    </div>
    <?php } ?>
    <div class="notification-item">
        <div class="icon-box bg-primary avatar">
            <ion-icon role="img" class="icon hw-icon hw ni-wallet-out md hydrated" aria-label="albums outline"></ion-icon>
        </div>
        <div class="content">
            <div class="notification-divider">
                <?= $data_notify['created_at'];?>
            </div>
            <div class="bubble">
                <?= $data_notify['notification'];?>
            </div>
        </div>
    </div>
    <?php } ?>
</div>