Question

EDIT: related to PHP HTML DomDocument getElementById problems

Can’t get getElementById() to work. Document is valid, according to using W3C validator. Plus my code should work even with a little invalid HTML.

This simple code looks for an image with id="banner" and replace it’s src attribute with another one. Works on my development machine (Windows), doesn’t work on server (Ubuntu).

Any idea of how to do this without getElementById()?

    libxml_use_internal_errors(true);

    // Create the DOMDocument and get the HTML content
    $document = new \DOMDocument();

    // Load HTML string and if it fails just return the content itself
    if(false === $document->loadHTML($content)) return $content;

    // Get DOMElement of the image with id="banner"
    $img = $document->getElementById('banner');

    // Return the content if it can't find the image
    if(null === $img) return $content;

    // Get image parent and remove the banner from DOM
    $parent = $img->parentNode;
    $parent->removeChild($img);

    // Set the new src attribute
    $img->setAttribute('src', 'http://mysite.come/img/myimage.png');

    // Append the modified node to banner parent
    $parent->appendChild($img);

    return $document->saveHTML();

Answer 1

Got it, don’t know how it’s invalid-document-proof:

$xpath = new \DOMXpath($document);
$nodes = $xpath->query('//img[@id="banner"]');

// Return content if we don't have exactly one image with id="banner"
if(1 !== $nodes->length) return $content;

// DOMNode of the banner
$banner = $nodes->item(0);

// Set the new src attribute and save the content
$banner->setAttribute('src', 'http://mysite.come/img/myimage.png');
$banner->ownerDocument->saveXML($banner);

return $document->saveXML();