PHP Advanced XML add to item node

Question

Я хочу добавить узел в указанный ниже XML, я хочу добавить элемент в узел данных, как показано ниже, с увеличением индекса элемента, я хочу сделать это, используя PHP

<?xml version="1.0" encoding="utf-8"?> 
<data> 
    <item id="1" order="1"> 
     <properties> 
      <item propertyType="1"><![CDATA[images/gallery/images/bg_ph_01.jpg]]></item> 
      <item propertyType="2"><![CDATA[images/gallery/thumbs/small_pic_01.jpg]]></item> 
      <item propertyType="3"><![CDATA[true]]></item> 
      <item propertyType="4"><![CDATA[openPopup;id=1]]></item> 
     </properties> 
    </item> 

    <item id="2" order="2"> 
     <properties> 
      <item propertyType="1"><![CDATA[images/gallery/images/bg_ph_02.jpg]]></item> 
      <item propertyType="2"><![CDATA[images/gallery/thumbs/small_pic_02.jpg]]></item> 
      <item propertyType="3"><![CDATA[false]]></item> 
      <item propertyType="4"><![CDATA[]]></item> 
     </properties> 
    </item> 

    <item id="3" order="3"> 
     <properties> 
      <item propertyType="1"><![CDATA[images/gallery/images/bg_ph_03.jpg]]></item> 
      <item propertyType="2"><![CDATA[images/gallery/thumbs/small_pic_03.jpg]]></item> 
      <item propertyType="3"><![CDATA[false]]></item> 
      <item propertyType="4"><![CDATA[]]></item> 
     </properties> 
    </item> 
</data> 

Может кто-нибудь помочь мне

Answer 1

Функция simplexml_insert_after Взято отсюда: PHP SimpleXML: insert node at certain position

<?php 
$xml = new SimpleXMLElement('<?xml version="1.0" encoding="utf-8"?> 
<data> 
    <item id="1" order="1"> 
     <properties> 
      <item propertyType="1"><![CDATA[images/gallery/images/bg_ph_01.jpg]]></item> 
      <item propertyType="2"><![CDATA[images/gallery/thumbs/small_pic_01.jpg]]></item> 
      <item propertyType="3"><![CDATA[true]]></item> 
      <item propertyType="4"><![CDATA[openPopup;id=1]]></item> 
     </properties> 
    </item> 

    <item id="2" order="2"> 
     <properties> 
      <item propertyType="1"><![CDATA[images/gallery/images/bg_ph_02.jpg]]></item> 
      <item propertyType="2"><![CDATA[images/gallery/thumbs/small_pic_02.jpg]]></item> 
      <item propertyType="3"><![CDATA[false]]></item> 
      <item propertyType="4"><![CDATA[]]></item> 
     </properties> 
    </item> 

    <item id="3" order="3"> 
     <properties> 
      <item propertyType="1"><![CDATA[images/gallery/images/bg_ph_03.jpg]]></item> 
      <item propertyType="2"><![CDATA[images/gallery/thumbs/small_pic_03.jpg]]></item> 
      <item propertyType="3"><![CDATA[false]]></item> 
      <item propertyType="4"><![CDATA[]]></item> 
     </properties> 
    </item> 
</data>'); 

function simplexml_insert_after(SimpleXMLElement $insert, SimpleXMLElement $target) 
{ 
    $target_dom = dom_import_simplexml($target); 
    $insert_dom = $target_dom->ownerDocument->importNode(dom_import_simplexml($insert), true); 
    if ($target_dom->nextSibling) { 
     return $target_dom->parentNode->insertBefore($insert_dom, $target_dom->nextSibling); 
    } else { 
     return $target_dom->parentNode->appendChild($insert_dom); 
    } 
} 

foreach($xml->xpath('/data/item') as $node) { 
    $id = (int)$node['id']; 
} 

$next_id = $id + 1; 


simplexml_insert_after(new SimpleXMLElement('<item id="'.$next_id.'" order="'.$next_id.'"> 
     <properties> 
      <item propertyType="1"><![CDATA[images/gallery/images/bg_ph_03.jpg]]></item> 
      <item propertyType="2"><![CDATA[images/gallery/thumbs/small_pic_03.jpg]]></item> 
      <item propertyType="3"><![CDATA[false]]></item> 
      <item propertyType="4"><![CDATA[]]></item> 
     </properties> 
    </item>'), $xml); 

var_dump($xml->asXML());