I drew a picture of the database performance for editing. But I try not to choose a new image. Then press the update appears that it does not send the originals back.

If you choose a new image It was able to get regular updates. If not, select and click Update. The original image data can not be sent. And can not be displayed.

sorry i'm not good english

<?php
session_start();
//PUT THIS HEADER ON TOP OF EACH UNIQUE PAGE
if($_SESSION['Level'] != "Admin"){
   header("location:../index.php");

  header("Content-type: text/html; charset=utf-8");
}

include "config.php";

if(isset($_GET['u'])):
     if(isset($_POST['bts'])):

$sql="SELECT * FROM  image where image_id= '$image_id' ";

  $image_id = "";
  if(is_uploaded_file($_FILES['file']['tmp_name']))  {
    if($_FILES['file']['error'] == 0) {
      include "lib/IMager/imager.php";
      $img = image_upload('file');
      $img = image_to_jpg($img);
      $img = image_resize_max($img, 600, 300); //ให้ภาพกว้างไม่เกิน 600px สูงไม่เกิน 300px
      $f = image_store_db($img, "image/jpeg");

        $sql = "REPLACE INTO image VALUES('$image_id', '$f')";
      mysqli_query($mysqli, $sql);
      $image_id = mysqli_insert_id($mysqli);
    }
  }

  $t = $_POST['topic'];
  $c = $_POST['content'];
  $w = $_POST['writer'];
  $article_id = $_POST['article_id'];

$sql = "REPLACE INTO article VALUES('$article_id', '$t', '$c', '$w', NOW(), 0, '$image_id')";
  if(@mysqli_query($mysqli, $sql)) {
      $msg = "<div class='alert alert-success'>
      <span class='glyphicon glyphicon-info-sign'></span> &nbsp;ประกาศข่าวสารเรียบร้อยแล้ว<p/>
                            ระบบ\'จะนำคุณกำลับไปยังหน้าล็อคอินในอีก 5 วินาที.</p>
     </div>";

     header ("refresh:5; url=index.php");

  }
  else {
    echo '<h3 class="waringing">เกิดข้อผิดพลาดในการบันทึกข้อมูล กรุณาลองใหม่</h3>';

  }
          endif;
     endif;

/*

    $res = $mysqli->query("SELECT * FROM article WHERE article_id =".$_GET['u']);
     $row = $res->fetch_assoc();*/

   //ภาพดีฟอลต์ กรณีไม่ได้กำหนดรูปภาพเอาไว้

   echo $sql = "SELECT article.*, image.image_content
       FROM article LEFT JOIN image
       on article.image_id = image.image_id
       WHERE article_id =".$_GET['u'];
       $result = $mysqli->query($sql);
?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Limitless - Responsive Web Application Kit by Eugene Kopyov</title>
  <!-- Global stylesheets -->
  <link href="https://fonts.googleapis.com/css?family=Roboto:400,300,100,500,700,900" rel="stylesheet" type="text/css">
  <link href="assets/css/icons/icomoon/styles.css" rel="stylesheet" type="text/css">
  <link href="assets/css/bootstrap.css" rel="stylesheet" type="text/css">
  <link href="assets/css/core.css" rel="stylesheet" type="text/css">
  <link href="assets/css/components.css" rel="stylesheet" type="text/css">
  <link href="assets/css/colors.css" rel="stylesheet" type="text/css">
  <!-- /global stylesheets -->

  <!-- Core JS files -->
  <script type="text/javascript" src="assets/js/plugins/loaders/pace.min.js"></script>
  <script type="text/javascript" src="assets/js/core/libraries/jquery.min.js"></script>
  <script type="text/javascript" src="assets/js/core/libraries/bootstrap.min.js"></script>
  <script type="text/javascript" src="assets/js/plugins/loaders/blockui.min.js"></script>
  <!-- /core JS files -->

  <!-- Theme JS files -->
  <script type="text/javascript" src="assets/js/plugins/uploaders/fileinput.min.js"></script>

  <script type="text/javascript" src="assets/js/core/app.js"></script>
  <script type="text/javascript" src="assets/js/pages/uploader_bootstrap.js"></script>

  <script type="text/javascript" src="assets/js/plugins/ui/ripple.min.js"></script>
  <!-- /theme JS files -->
  <!-- Theme JS files -->
  <script type="text/javascript" src="ckeditor/ckeditor.js"></script>
  <script type="text/javascript" src="assets/js/pages/editor_ckeditor.js"></script>

  <script type="text/javascript" src="assets/js/plugins/ui/ripple.min.js"></script>
  <!-- /theme JS files -->

<script>
$(function() {
  $(document).on('change', '#file', function() {
    if(this.files[0].size > 512000) {
      alert('ไฟล์ภาพมีขนาดใหญ่เกินกำหนด (500 KB) อาจมีปัญหาในการอัปโหลด กรุณาเปลี่ยนใหม่');
      //$(this).replaceWith($(this).clone());
      $('input:file').clearInputs();  //อยู่ในไลบรารี form.js
    }
  });
});
</script>
</head>
<body>
<div><?php require_once("/include/header.php"); ?></div>

  <?php require_once("/include/main.php"); ?>

  <!-- Page container -->
  <div class="page-container">

    <!-- Page content -->
    <div class="page-content">

      <!-- Content area -->
        <div class="content">
    <!-- Main content -->
      <div class="content-wrapper">
            <!-- CKEditor readonly API -->
          <div class="panel panel-flat">
            <div class="panel-heading">
              <h5 class="panel-title">บทความใหม่</h5>
              <div class="heading-elements">
                <ul class="icons-list">
                          <li><a data-action="collapse"></a></li>
                          <li><a data-action="reload"></a></li>
                          <li><a data-action="close"></a></li>
                        </ul>
                      </div>

            </div>

            <div class="panel-body">

              <?php
              while($row = mysqli_fetch_array($result)) {
                $image = $row['image_content'];
                $images = $row['image_id'];
                $article_id = $row['article_id'];
                $topic = $row['topic'];
                $article_text = $row['article_text'];
                $writer = $row['writer'];

              ?>

              <form id="new-article" method="post" enctype="multipart/form-data">
                <div class="row">
                  <div class="col-md-12">
                    <div class="form-group">
                    <label class="control-label text-semibold">รูปหัวบทความ:</label>

                    <input type="hidden" name="MAX_FILE_SIZE" value="512000">
                    <input type="file" name="file" id="file" value="<?php $image ?>" class="file-input" data-show-upload="false" data-show-caption="true" data-show-preview="true" accept="image/*" >

                    <br/>
                    <?php
                    echo "<img src='data:image/jpeg;base64,".base64_encode($image)."' class='img-responsive'   />";
                    ?>

                    </div>
                  </div>

              <div class="col-md-6">
                    <div class="form-group">
                      <label class="text-semibold">หัวข้อ:</label>
                        <input type="hidden" name="article_id" value="<?php echo $article_id ?>">
                        <input type="hidden" name="image_id" value="<?php $images; ?>" >
                        <input type="text"  value="<?php echo $topic; ?>" name="topic" class="form-control" placeholder="หัวข้อ" required>

                    </div>
                  </div>
                </div>

                <div class="mb-15">
                  <textarea name="content"  id="editor-full" rows="4" cols="4">
                                  <?php echo $article_text; ?>
                                </textarea>
                      </div>
                        <div class="row">
                  <div class="col-md-6">
                    <div class="form-group">
                            <label class="control-label text-semibold">ชื่อผู้เขียน:</label>
            <input type="text" class="form-control" name="writer" value="<?php echo $writer; ?>" placeholder="ชื่อผู้เขียน *"required>
              </div>
                  </div>
                      <div class="text-right">
                        <button type="submit" name="bts" class="btn bg-teal-400">Submit form <i class="icon-arrow-right14 position-right"></i></button>
                      </div>
                      <?php } ?>
                    </form>
            </div>
          </div>

</article>
<script type="text/javascript">
CKEDITOR.replace( 'editor-full', {
    filebrowserBrowseUrl: './browser/imgbrowser.php',
    filebrowserUploadUrl: './uploader/upload.php'
});
</script>

</body>
</html>
<?php @mysqli_close($mysqli); ?>

<article>