Append/combine/merge one simplexml to another:

<?php
include 'example.php';
$el1 = new SimpleXMLElement($xmlstr);
$el2 = new SimpleXMLElement($xmlstr);

// wrong way!
// php convert $el2->movie[0] to string silently
$el1->addChild('movie', $el2->movie[0]);

// wrong way!
// php 5.1 convert $el2->movie[0] to string and generate Warning: It is not yet possible to assign complex types to properties. It is not possible to assign complex types to nodes
// php 5.2 convert $el2->movie[0] to string silently
$el1->addChild('movie');
$el1->movie[2] = $el2->movie[0];

// right way!
$el1_movie = $el1->addChild('movie');
append_simplexml($el1_movie, $el2->movie[0]);

echo "<pre>"; print_r($el1); echo "</pre>";

/**
 * Add one simplexml to another
 *
 * @param object $simplexml_to
 * @param object $simplexml_from
 * @author Boris Korobkov
 * @link http://www.ajaxforum.ru/
 */
function append_simplexml(&$simplexml_to, &$simplexml_from)
{
    foreach ($simplexml_from->children() as $simplexml_child)
    {
        $simplexml_temp = $simplexml_to->addChild($simplexml_child->getName(), (string) $simplexml_child);
        foreach ($simplexml_child->attributes() as $attr_key => $attr_value)
        {
            $simplexml_temp->addAttribute($attr_key, $attr_value);
        }
        
        append_simplexml($simplexml_temp, $simplexml_child);
    }
}
?>