Question

I’m using this code to get the alt attribute from img tags using domdocument. If a page has images without an alt attribute or if the alt attribute is empty it doesn’t recognize that. I need some help writing the conditions to check for empty alt attributes as well as none at all. Thanks

$name =  trim($words->nodeName);
    if($name == 'img' ) 
        {
            $alt= $words->getAttribute('alt');
            if(!empty($alt)) 
        {
    $this->matchedAnchors[$this->count]['alt']     =  trim($words->getAttribute('alt'));

Answer 1

You can use XPath for that:

//img[normalize-space(@alt) != '']

Example:

$xml = <<< XML
<ul>
    <li><img alt="foo"/></li>
    <li><img alt="   "/></li>
    <li><img alt=""/></li>
    <li><img /></li>
</ul>
XML;

$dom = new DOMDocument;
$dom->loadXML($xml);
$xp = new DOMXPath($dom);

foreach ($xp->query('//img[normalize-space(@alt) != ""]') as $img) {
    echo $dom->saveXML($img);
}

will only print

<img alt="foo"/>

Demo on codepad