Я попытался использовать 2 цикла while для одного и того же запроса.

First is for slideshow,another one is for posts.Second while executed after the endwhile. But when I delete first while then I was able to get posts otherwise only 1st while is working

<pre><?php

  include "libs/db.php";
  include "libs/config.php";
  include "libs/function.php";

  $db = new database();
  $query = "SELECT * from posts order by id DESC";
$posts = $db->select($query);
$query = "SELECT * from categories";
$cats = $db->select($query);

?>

<?php while($row1 = $posts->fetch_array()) :?>

        <div class="welcome-single-slide">
            <!-- Post Thumb -->
                        <img src="images/<?php echo $row1['image'];?>" alt="">

            <div class="project_title">

                <div class="post-date-commnents d-flex">
                    <a href="#">May 19, 2017</a>
                    <a href="#">5 Comment</a>

                </div>
                <a href="single.php?idd=<?php echo $row1['id'];?>">
                    <h5>“<?php echo $row1['title'];?>"</h5>

                </a>

            </div>

            <!-- Overlay Text -->
        </div>

    <?php endwhile;?>

    </section>

    
    <!-- ****** Welcome Area End ****** -->

    <!-- ****** Categories Area Start ****** -->
    <section class="categories_area clearfix" id="about">
        <div class="container">
            <div class="row">

<?php while ($row = $posts->fetch_array()) :?>
                  <!-- Single Post -->
                  <div class="col-12">
                      <div class="list-blog single-post d-sm-flex wow fadeInUpBig" data-wow-delay=".8s">
                          <!-- Post Thumb -->


                          <div class="post-thumb">
                              <img src="images/<?php echo $row['image'];?>" alt="">
                          </div>
                          <!-- Post Content -->
                          <div class="post-content">
                              <div class="post-meta d-flex">
                                  <div class="post-author-date-area d-flex">
                                      <!-- Post Author -->
                                      <div class="post-author">
                                          <a href="#"><?php echo $row['author'];?></a>
                                      </div>
                                      <!-- Post Date -->
                                      <div class="post-date">
                                          <a href="#"><?php echo $row ['date'];?></a>
                                      </div>
                                  </div>
                                  <!-- Post Comment & Share Area -->
                                  <div class="post-comment-share-area d-flex">
                                      <!-- Post Favourite -->
                                      <div class="post-favourite">
                                          <a href="#"> 10</a>
                                      </div>
                                      <!-- Post Comments -->
                                      <div class="post-comments">
                                          <a href="#"> 12</a>
                                      </div>
                                      <!-- Post Share -->
                                      <div class="post-share">
                                          <a href="#"></a>
                                      </div>
                                  </div>
                              </div>
                              <a href="#">
                                  <h4 class="post-headline"><?php echo $row ['title'];?></h4>
                              </a>
                              <p><?php echo substr($row ['content'],0,300);?></p>
                              <a id="continuereading" href="single.php?idd=<?php echo $row ['id'];?>" class="read-more">Continue Reading..</a>

                          </div>
                      </div>
                  </div>
             <!--This is the second while for the same query-->
                <?php endwhile ;?>