อยากให้คำที่เราค้นหา ยังคงปรากฏอยู่ ในขณะที่่ผลการค้นหา แสดงแล้วค่ะ

<center>
    <form method="post">
      <input type="text"  name="txt_search" size="50"  />
     <input type="submit" name="search" value="Search" />
    </form>
</center>
        <section class="content-header">
          <h1>
            Show Product Details       
          </h1>        
        </section>
        <!-- Main content -->
        <section class="content">
      <div class="CSSTableGenerator" >
  <table id="example">   
				<thead>
					<tr>						
                		<td>Name</td>
                		<td>Code</td>       		
                		<td>Price</td>
                		<td>Picture</td>
					</tr>
				</thead>
				<tbody>                
				   <?php
              $sql=" select * from product_vw3 ";
              
                if(isset($_POST['search']))
              {
                  $txt_search=$_POST['txt_search'];
                  $sql.=" where";
                  $sql.=" pro_no like '%".$txt_search."%'";
                  $sql.=" or";
                  $sql.=" pro_name like '%".$txt_search."%'";  
                  $sql.=" or";
                  $sql.=" type_name like '%".$txt_search."%'"; 
              }                          
					$result = $conn->query($sql);
					if ($result->num_rows > 0) {

						while($row = $result->fetch_assoc()) {
							echo "<tr>";	
                                                                echo "<td>" . $row["pro_name"]. "</td>";														
								echo "<td> <a href='view_product.php?pro_id=" .$row['pro_id']. "'>".$row["pro_no"]." 
                                                                                   </a></td>";
								echo "<td>" . $row["pro_sell"]. "</td>";																
								
							        echo "<td><img src=\"../upload/".$row["pro_pic1"]."\" width='100'/></td>";
								
						}
					}					
					?> 
				</tbody>
			</table>		
  </body>
</html>
<?php //include('footer.php'); ?>