PHP DOM Get <option> Tag That Is Selected

Question

So let's say the HTML looks something like this:

<select name="some_name">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3" selected="selected">3</option>
    <option value="4">4</option>
</select>

I need to extract the option tag with attribute selected="selected" from there. How can I do that? So far I have this:

$string = file_get_contents('test.html');

include 'htmlpurifier-4.0.0-standalone/HTMLPurifier.standalone.php';
$config = HTMLPurifier_Config::createDefault();
$config->set('HTML.Doctype', 'XHTML 1.0 Strict');
$purifier = new HTMLPurifier($config);
$string = $purifier->purify($string);

$dom = new DOMDocument();
$dom->loadHTML('<?xml encoding="UTF-8">' . $string);
$dom->preserveWhiteSpace = false;

$num = 0;

$optionTags = $dom->getElementsByTagName('option');
foreach ($optionTags as $o) {
    if ($o->hasAttribute('selected')
        && 'selected' === $o->getAttribute('selected')) {
        $num = $o->nodeValue;
    }
}

echo $num;

And that doesn't work. The $num is still equal to zero afterwards.

Answer 1

How about using simplexml and XPath selectors?

$xml = new SimpleXMLElement($htmlString);
$result = $xml->xpath('//option[@selected="selected"]');

$option = array_pop($result);
var_dump($option);

(tested, working on PHP 5.3.0)

Answer 2

I believe it does not work because you are forgetting to access the DOMNodeList's item using its property item.

Try this approach, loop through the entire length of the DOMNodeList returned. Checked if the DOMNode at the current item's index has an attribute named "selected"

$num = 0;
$optionTags = $dom->getElementsByTagName('option');
for ($i = 0; $i < $optionTags->length; $i++ ) {
 if ($optionTags->item($i)->hasAttribute('selected') 
           && $optionTags->item($i)->getAttribute('selected') === "selected") {
     $num = $optionTags->item($i)->nodeValue;
 }
}

EDIT:

My exact code:

$dom = new DOMDocument();
$dom->load("C:\\test.htm");
$num = 0;
$optionTags = $dom->getElementsByTagName('option');
for ($i = 0; $i < $optionTags->length; $i++ ) {
  if ($optionTags->item($i)->hasAttribute('selected') 
         && $optionTags->item($i)->getAttribute('selected') === "selected") {
       $num = $optionTags->item($i)->nodeValue;
  }
}
echo "Num is " . $num;

Output:

Num is 3

Answer 3

Your next step in debugging is to verify that $string contains the value you expect. The original code posted is correct.