อยากจะทำ search แบบเพิ่มตัว dropdown list เพื่อใช้เลือกประเภทในการ searchอะครับ

   <input  style="height:30px; " class="form-control "  name="txtKeyword" type="text" id="txtKeyword" value="<?php echo $strKeyword;?>">

					</td>
					<td> <input class="btn" type="submit" value="Search"></th></td>
					</tr>
	</table>
</center>
			<br>
		</form>
		<?php

			$sql = "SELECT u.username,p.pre,p.name,p.surname,u.emp_code,u.statusUser FROM users_client as u ,profile_cat as p where u.emp_code = p.emp_code  AND name LIKE '%".$strKeyword."%' ";
			$query = mysqli_query($con,$sql);

			$num_rows = mysqli_num_rows($query);

			$per_page = 100;   // Per Page
			$page  = 1;

			if(isset($_GET["Page"]))
			{
				$page = $_GET["Page"];
			}

			$prev_page = $page-1;
			$next_page = $page+1;

			$row_start = (($per_page*$page)-$per_page);
			if($num_rows<=$per_page)
			{
				$num_pages =1;
			}
			else if(($num_rows % $per_page)==0)
			{
				$num_pages =($num_rows/$per_page) ;
			}
			else
			{
				$num_pages =($num_rows/$per_page)+1;
				$num_pages = (int)$num_pages;
			}
			$row_end = $per_page * $page;
			if($row_end > $num_rows)
			{
				$row_end = $num_rows;
			}

		$sql .= " ORDER BY u.emp_code ASC LIMIT $row_start ,$row_end ";
			$query = mysqli_query($con,$sql);

		?>