Design and Architecture

<pre>$sql = "SELECT `name`, `email`, `comment` FROM `blog1`";
$result = $conn->query( $sql );
$count = 0;
$images = array("user1.jpg", "user2.jpg", "user3.jpg"); // 

if( $result->num_rows > 0 ) {
    // output data of each row
    while( $row = $result->fetch_assoc() ) {
            echo '
                <div class="comment-block">
                    '.( !empty( $images[$count] ) ? '<img src="images/blog/'.$images[$count].'">' : '').' <!-- Add the count to the images to use it as a key, add check to see if count is a key -->
                    '.$row['name'].'
                    '.$row['comment'].'
                </div>
            '; 

        $count++; you want
        if( $count == 3 )
        {
          $count = 0; // Reset to 0 if 3 images have been shown
        }
    } 
}

<pre><pre lang="PHP">