Arkadaşlar thumb da resim seçilince active olayını bi türlü yapamadım.

<div id="carousel-product" class="carousel slide carousel-thumbnails mb-3" data-ride="carousel">
                                    <div class="carousel-inner" role="listbox">
                                          <?php
                        $alt_img = '';
                        $query = $db->query("SELECT * FROM urun_img WHERE urun_id = '{$urun['id']}'", PDO::FETCH_ASSOC);
                        if($query->rowCount()){
                          foreach($query as $row){
                            echo '
                                        <div class="carousel-item [B]active[/B]">
                            <img class="img-responsive" src="upload/'.$row['img'].'"></div>';
                            $alt_img.= '
                            <li data-target="#carousel-product" data-slide-to="1" class="verso-transition [B]active[/B]">
                                            <img src="upload/'.$row['img'].'" alt="'.$urun['baslik'].'">
                                        </li>
                            ';
                          }
                        }
                    ?>          
                                    </div>
                                    <ol class="carousel-indicators -mb--2">
                                        <?php echo $alt_img; ?>
                                    </ol>
                                </div>