Get innerHTML of a php DOMElement

DOMElement.innerHTML.php

<?php
// See http://www.php.net/manual/en/class.domelement.php#101243
function get_inner_html( $node ) {
    $innerHTML= '';
    $children = $node->childNodes;
    foreach ($children as $child) {
        $innerHTML .= $child->ownerDocument->saveXML( $child );
    }

    return $innerHTML;
} 
?>

Thank you all