如何获取DOMNode的innerHTML？

比较与此更新变种PHP手册用户注意＃89718：

<?php function DOMinnerHTML(DOMNode $element) {     $innerHTML = "";     $children  = $element->childNodes;    foreach ($children as $child)     {         $innerHTML .= $element->ownerdocument->saveHTML($child);    }    return $innerHTML; } ?>

例：

<?php $dom= new DOMdocument(); $dom->preserveWhiteSpace = false;$dom->formatOutput       = true;$dom->load($html_string);$domTables = $dom->getElementsByTagName("table");// Iterate over DOMNodeList (Implements Traversable)foreach ($domTables as $table) {     echo DOMinnerHTML($table); } ?>