How to modify xml data using php - Part 1

In modify.php add the following code:

<?php

$modifybook = $_GET['bid'];

$doc = new DOMDocument();

$doc->load( 'loaned.xml' );

 

$booklist = $doc->getElementsByTagName( "book" );

foreach( $booklist as $book )

{

$bookids = $book->getElementsByTagName( "ID" );

$bookid = $bookids->item(0)->nodeValue;

if($bookid == $modifybook){

      $booktitles= $book->getElementsByTagName( "title" );

      $booktitle = $booktitles->item(0)->nodeValue;

      $dates= $book->getElementsByTagName( "date" );

      $date= $dates->item(0)->nodeValue;

     

      $retdates = $book->getElementsByTagName( "retdate" );

      $retdate = $retdates->item(0)->nodeValue;

     

      $sids = $book->getElementsByTagName( "SID" );

      $sid = $sids->item(0)->nodeValue;

      echo "<tr> 

     <td colspan=\"2\" class=\"labelcell\"><label for=\"btitle\">Book Title:</label></td>

     <td colspan=\"2\"class=\"fieldcell\"><input type=\"text\" value=\"$booktitle\" id=\"btitle\" name=\"btitle\"  tabindex=\"1\"/></td>

   </tr>

      <tr> 

     <td colspan=\"2\" class=\"labelcell\"><label for=\"bdate\">Book Issue date:</label></td>

     <td colspan=\"2\" class=\"fieldcell\"> <input type=\"text\" id=\"bdate\" name=\"bdate\" value=\"$date\"  tabindex=\"2\"/><br />

</td>

   </tr>

         <tr> 

     <td colspan=\"2\" class=\"labelcell\"><label for=\"bookrentdate\">Book Rent date:</label></td>

     <td colspan=\"2\" class=\"fieldcell\"> <input type=\"text\" id=\"bookrentdate\" value=\"$retdate\" name=\"bookrentdate\" tabindex=\"3\"/> <br />

</td>

   </tr>

   <tr>

 <td colspan=\"2\" class=\"labelcell\"><label for=\"booksid\">Book SID :</label></td>

    <td colspan=\"2\"><input type=\"text\" id=\"booksid\" name=\"booksid\" value=\"$sid\" tabindex=\"4\">

    <input type=\"hidden\" value=\"$bookid\" id=\"bid\" name=\"bid\" />

    </td></tr>

     </td>

   </tr>";   

  }

}

?>  

   <tr><td colspan="4"><input type="submit" name="upload" class="box" value="Update" tabindex="5" /></td></tr>

  </table> 

</form>

Then on submit of above form, it will call the update.php where we should use following code:
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