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i have a problem with the code, i dont know what it is. When i click the edit button for the second node, the first node is displaying in edit and not the second one

    <?php
 $xml = new DOMDocument();
 $xml->load('mystore.xml');

 $element = $xml->getElementsByTagName('store')->item(0);  

 $itemcategory = $element->getElementsByTagName('itemcategory')->item(0);
 $itemname = $element->getElementsByTagName('itemname')->item(0) ;
  $itemdesc = $element->getElementsByTagName('itemdesc')->item(0) ;
  $itemprice = $element->getElementsByTagName('itemprice')->item(0) ;
   $itemquantity = $element->getElementsByTagName('itemquantity')->item(0) ;

 $element->replaceChild($itemcategory, $itemcategory);
 $element->replaceChild($itemname, $itemname);
  $element->replaceChild($itemdesc, $itemdesc);
 $element->replaceChild($itemprice, $itemprice);
 $element->replaceChild($itemquantity, $itemquantity);
 ?>

 <?php
 if (isset($_POST['submit']))
 {
$itemcategory->nodeValue = $_POST['itemcategory'];
$itemname->nodeValue = $_POST['itemname'];
$itemdesc->nodeValue = $_POST['itemdesc'];
$itemprice->nodeValue = $_POST['itemprice'];
$itemquantity->nodeValue = $_POST['itemquantity'];
htmlentities($xml->save('mystore.xml'));
header('location: adminpage.php');



 }

 ?>

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