PHP DomDocument nodeValue returns Duplicate value

Question

I am processing very simple html code using php domdocument and xpath. I am getting duplicate value of dom node.

PHP Code

<?php

$html = <<<HTML

    <div id="my-cats">

        <ul class="category_list">

            <li class="item reference">
                <span class="the_score"><b>35</b></span>
                <span class="the_category">Reference / Education</span>
            </li>

            <li class="item computer">
                <span class="the_score"><b>50</b></span>
                <span class="the_category">Computer / Internet</span>
            </li>

        </ul>

        <ul class="category_list">

            <li class="item home">
                <span class="the_score"><b>22</b></span>
                <span class="the_category">Home / Gardening</span>
            </li>

            <li class="item home">
                <span class="the_score"><b>12</b></span>
                <span class="the_category">Home / Repair</span>
            </li>

        </ul>

    </div>

HTML;

$dom = new DOMDocument();
@$dom->loadHTML($html);

$finder = new DOMXPath($dom);

$cats = $finder->query('//div[@id="my-cats"]//ul[@class="category_list"]//li');

foreach( $cats as $li ){
    echo $li->getAttribute('class') . "\n";
    $value = trim($finder->query('//span[@class="the_score"]', $li)->item(0)->nodeValue);
    $key = trim($finder->query('//span[@class="the_category"]', $li)->item(0)->nodeValue);
    echo "$key : $value\n";
}

Output

item reference 
Reference / Education : 35 

item computer 
Reference / Education : 35 

item home 
Reference / Education : 35 

item home 
Reference / Education : 35

As you can see I am echoing the classnames which shows the $li element I am processing is different. Yet I get only first value of the dom node.

You can see the problem live in here https://3v4l.org/tjJB5

Martin Honnen · Accepted Answer · 2016-03-23 11:59:33Z

1

Change the inner queries to e.g. $finder->query('span[@class="the_score"]', $li) to search span children of $li.

answered Mar 23, 2016 at 11:59

Martin Honnen

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2 Comments

Sisir Over a year ago

Thank you! Can you explain a bit?

Martin Honnen Over a year ago

A path starting with / selects down from the document containing the context node so your attempts with $finder->query('//span[@class="the_score"]', $li) search the whole document in which the $li element is contained. If you want to select child elements then the shortest is the path span which is short for child::span. Descendants you could find with descendant::span or .//span.

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