[PHP] pobierz, plaintext 
    $str ="
<datas>
      <books> 
        <book>
            <id>1</id>
            <title>PHP Undercover</title>     
            <author>Wiwit Siswoutomo</author>
        </book>
        <book>
              <id>2</id>
              <title>PHP Enterprise</title>     
              <author>Wiwit Siswoutomo</author>
        </book>
    </books>
</datas>
";
 
    $dom = new DOMDocument();
    $dom->loadXML($str);
 
    //    $dom settings
    $dom->formatOutput = true;
    $dom->preserveWhiteSpace = false;
 
    //    get root element(datas)
    $root = $dom->documentElement;
 
    //create new book's nodes
    $id = $dom->createElement('id');
    $id->appendChild($dom->createTextNode('3'));
 
    $title = $dom->createElement('title');
    $title->appendChild($dom->createTextNode('Kamienie na szaniec'));
 
    $author = $dom->createElement('author');
    $author->appendChild($dom->createTextNode('Aleksander Kaminski'));
 
    // create new book node
    $newBook = $dom->createElement('book');
    //    append childs to new book
    $newBook->appendChild($id);
    $newBook->appendChild($title);
    $newBook->appendChild($author);
 
    //    get parent for book
    $books = $dom->getElementsByTagName('books')->item(0);
 
    //    add new book to $dom
    $books->appendChild($newBook);
 
    // display
    echo '<xmp>'.$dom->saveXML().'</xmp>';
[PHP] pobierz, plaintext 

[PHP] pobierz, plaintext 
    $dom = new DOMDocument();
    $dom->formatOutput = true;
    $dom->preserveWhiteSpace = false;
    $dom->loadXML($str);
[PHP] pobierz, plaintext