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Asked: 2026-05-25T20:47:00+00:00

I have piece of PHP code. PHP: $Implementation = new DOMImplementation(); $Document = $Implementation->createDocument(

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I have piece of PHP code.

PHP:

$Implementation = new DOMImplementation();
$Document = $Implementation->createDocument( NULL, NULL, $Implementation->createDocumentType( 'html' ) );
$Document->encoding = 'utf-8';
$Document->loadXML( $main_html[ 'main' ] ); // load main.html
$Document->xinclude();
$Fragment = $Document->createDocumentFragment();
$Fragment->appendXML( $main_html[ 'page' ] ); // load page.html
$Document->getElementById( 'content' )->appendChild( $Fragment );
...

Everything works well except last line, appears error:

PHP Fatal error:  Call to a member function appendChild() on a non-object

It seems getElementById() method doesn’t work for $Document.

Look at the HTML.

HTML (main.html):

...
    </head>
    <body xmlns:xi="http://www.w3.org/2001/XInclude">
        <xi:include href="wrapper.html" />
    </body>
</html>

HTML (wrapper.html):

<section
    id="wrapper"
    xmlns:xi="http://www.w3.org/2001/XInclude">
    <xi:include href="header.html" />
    <xi:include href="nav.html" />
    <xi:include href="content.html" />
    <xi:include href="aside.html" />
    <xi:include href="footer.html" />
</section>

HTML (content.html):

<section id="content" />

I added $Document->validateOnParse = TRUE; before $Document->loadXML( $main_html[ 'main' ] ); and tested without XInclude, but doesn`t work.

Finally I found the solution, bad line replace with:

$Document->getElementsByTagName( 'section' )->item( 1 )->appendChild( $Fragment );

getElementsByTagName() method works for $Document but doesn’t satisfy me. Did I missed something?

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1 Answer

  1. Editorial Team

    You have to pass a DTD which defines the id attribute. Otherwise, you cannot use getElementById.

    For more information, see:

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