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[2014-09-02 12:48 UTC] daverandom@php.net
Description:
------------
A common usage of DOM is a pattern roughly like this:
// A HTML fragment as a string, probably loaded from external source
$html = <<<HTML
<div>
<span>Some random data</span>
</div>
HTML;
$doc = new DOMDocument;
$doc->loadHTML($html);
// manipulate the data
$data = $doc->saveHTML();
By default, libxml will wrap this fragment in <html><body> tags, meaning that saveHTML() exports a whole document and not just a fragment, which is not likely to be the desired result.
While it is possible to avoid this when loading the document using the LIBXML_HTML_NOIMPLIED flag, it's often desirable to accept a DOMDocument as an argument to a routine that does not know whether this flag was used or not.
It is possible to pass a node to the saveHTML() routine (e.g. the <body> element) but this exports the container node as well as it's children. as a result, people often write code which strips this outer element from the fragment using string manipulation, which is error-prone and less than ideal.
A good way to make this situation easier to handle would be if saveHTML() could also accept a DOMNodeList, which would mean that *only* the children of an arbitrary element would be easy to export, using `$node->childNodes`.
This would also potentially have uses with XPath results.
Test script:
---------------
<?php
$html = <<<HTML
<div>
<span>Some random data</span>
</div>
HTML;
$doc = new DOMDocument;
$doc->loadHTML($html);
$body = $doc->getElementsByTagName('body')[0];
$body->appendChild($doc->createElement('span', 'more data'));
$data = $doc->saveHTML($body->childNodes);
echo $data;
Expected result:
----------------
<div>
<span>Some random data</span>
<span>more data</span>
</div>
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Last updated: Thu Apr 25 00:01:41 2024 UTC |
A working userland alternative is to append all child nodes to a new DOMDocumentFragment, and to export that: <?php $html = <<<HTML <div> <span>Some random data</span> </div> HTML; $doc = new DOMDocument; $doc->loadHTML($html); $body = $doc->getElementsByTagName('body')[0]; $body->appendChild($doc->createElement('span', 'more data')); $frag = $doc->createDocumentFragment(); foreach ($body->childNodes as $node) { $frag->appendChild($node); } $data = $doc->saveHTML($frag); echo $data; ?>