Check out example codes for "carousel inner item populate with for loop puting active class on all carousel item". It will help you in understanding the concepts better.

Code Example 1

<?php 
    include '../employee.php';
    $obj= new employees();
    $result=$obj->select_image();
 ?>
<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

    <title>Dhruv</title>
  </head>
  <body>

<div class="container-fluid">
    <div class="row">
            <div class="col-lg-12">
                <div id="carouselExampleInterval" class="carousel slide" data-ride="carousel">
                      <div class="carousel-inner">
                      <?php 
                      $count = 0;
                        foreach ($result as $values){
                      ?>
                        <div class="carousel-item <?php 
                            if($count==0){
                              echo "active";  
                            }
                            else{
                                echo " ";
                            }
                        ?>" data-interval="2000">
                          <img src="<?php echo $values['profile_pic']; ?>" class=" w-100 d-block " alt="...">
                        </div>
                        <?php 
                        $count++;
                        }
                        ?>
                       </div>
                      <a class="carousel-control-prev" href="#carouselExampleInterval" role="button" data-slide="prev">
                        <span class="carousel-control-prev-icon" aria-hidden="true"></span>
                        <span class="sr-only">Previous</span>
                      </a>
                      <a class="carousel-control-next" href="#carouselExampleInterval" role="button" data-slide="next">
                        <span class="carousel-control-next-icon" aria-hidden="true"></span>
                        <span class="sr-only">Next</span>
                      </a>
                    </div>
            </div>
    </div>
</div>
</div>

    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
  </body>
</html>

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