php - How to populate a form with data selected from options on my mysql data -

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i have form data selects data database. want each selected item have units echoed in corresponding unit input form. pls need simplified way of solving problem. here form:

<?php include ("header.php");?>  <?php  $start=1; $end= $_post['item'];  for($start;$start<=$end;$start++){  require("connect.php");  $sql = "(select * drug_name)";  $result = mysqli_query($conn, $sql); ?>  <form align="center" method="post" action="transactions.php" id='myform'>         name:         <select align="right" name="inputname[]" id='drug_item_name'  value="drug_item_name"><option selected="selected" value="0">s/n select drug --</option> <?php while($row = $result->fetch_assoc()){ ?>         <option ><?php echo$row['drug_item_name']?></option>             <?php }     ?>         </select>         <td  align="right">unit:</td>          <td><input type="text" name="input2[]"          placeholder="enter unit"   size="7" ></td>          <td  align="right">qty:</td>         <td><input type="text" name="input3[]" placeholder="enter qty" size="5"></td>         </tr>   <?php       echo '<br>'; ?>  <?php }  ?>  <td><input type="submit" name=dispense" size="10"  value="dispense"></td></table></form>          </form>


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