Call to Undefined Method Domdocument::Getelementsbyclassname()

Call to undefined method DOMDocument::getElementsByClassName()

Class DOMDocument does not contains method getElementsByClassName
Use xpath

$xpath = new DOMXpath($dom);
$xpath->query('//div[contains(@class, "localImage")]'); //instance of DOMNodeList

Get Element by ClassName with DOMdocument() Method

I finally used the following solution :

    $classname="blockProduct";
    $finder = new DomXPath($doc);
    $spaner = $finder->query("//*[contains(@class, '$classname')]");

Get text of element using DOM with PHP but return error

There isn't a getElementsByClassName function. You can either iterate over all elements of a specific type with https://www.php.net/manual/en/domdocument.getelementsbytagname.php then check their class for specifed value, https://www.php.net/manual/en/domelement.getattribute.php. Alternatively you can use an xpath.

$html = '<table>
  <tbody>
    <tr><tr>
    <tr>
        <td> 
            <table class="style124">
                <tbody>
                    <tr>
                        <td>A</td>
                    </tr>
                    <tr>
                        <td>B</td> //THIS !!
                    </tr>
                </tbody>
            </table>
        </td>
    </tr>
    <tr></tr>
  </tbody>
</table>';
$dom = new DOMDocument;
$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
$query = '//table[contains(@class, "style124")]/tbody/tr[2]/td';
$entries = $xpath->query($query);
foreach($entries as $entry){
    echo $entry->nodeValue;
}

https://3v4l.org/pDFhB

Additionally, getElementsByTagName returns a result set, you wouldn't just access it with -> you'd need to tell it which you wanted.

The alternative approach could be:

$html = '<table>
  <tbody>
    <tr><tr>
    <tr>
        <td> 
            <table class="style124">
                <tbody>
                    <tr>
                        <td>A</td>
                    </tr>
                    <tr>
                        <td>B</td> //THIS !!
                    </tr>
                </tbody>
            </table>
        </td>
    </tr>
    <tr></tr>
  </tbody>
</table>';
$dom = new DOMDocument;
$dom->loadHTML($html);
$tables = $dom->getElementsByTagName('table');
foreach($tables as $table){
    if(preg_match('/\bstyle124\b/', $table->getAttribute('class'))){
        $trs = $table->getElementsByTagName('tr');
        $tds = $trs[1]->getElementsByTagName('td');
        echo $tds[0]->nodeValue;
    }
}

note the base index difference between PHP and xpath, $trs[1] vs. tr[2].

https://3v4l.org/hLEFV

Can't find error with xpath query, `undefined method DOMDocument`

There isn't such method like xpath in DOMDocument.
See http://php.net/manual/en/class.domdocument.php

You need to initialize an instance of DOMXpath to use xpath queries

$doc = new DOMDocument();
$doc->strictErrorChecking = FALSE;
$doc->loadHTML($html);

$xpath = new DOMXpath($doc);

or alternatively call the method on the SimpleXMLObject you've created

$level1 = $xml->xpath('//*[contains(concat(" ", normalize-space(@class), " "), " category-wrap ")]/h2/a');

Call to undefined method DOMDocument::createDocumentType()

DOMDocument does not have a method named createDocumentType, as you can see in the Manual. The method belongs to the DOMImplemetation class. It is used like this (taken from the manual):

// Creates an instance of the DOMImplementation class
$imp = new DOMImplementation;

// Creates a DOMDocumentType instance
$dtd = $imp->createDocumentType('graph', '', 'graph.dtd');

// Creates a DOMDocument instance
$dom = $imp->createDocument("", "", $dtd);

Since you want to load HTML into the document, you don't need to specify a document type, since it is determined from the imported HTML. You just have to have some id attributes, or a DTD that identifies an other attribute as an id. This is part of the HTML file, not the parsing PHP code.

$dom = new DOMDocument();
$dom->loadHTML($result);
$element = $dom->getElementById('my_id');

will do the job.

Fatal error: Call to undefined method DOMDocument::getElementsById()

getElementsById() is not a method of DOMDocument, you should try getElementById() instead. I don't even think two elements can have the same id, so you won't be able to get a collection (array) based on id.

PHP Xpath: Get node value by class name

har07's answer was on the right track, but it only returned the node list with length set to 3 like I was already receiving with my existing code.

Original code:

$productPrice = $productRaw[1]->getElementsByTagName('li');

har07's suggestion:

$productPrice = $xpath->query('.//li[contains(@class, "itemtwo")]', $productRaw->item(1));

Solution, which returns the node value where an elements class name is equal to itemtwo:

$productPrice = $xpath->query('.//li[contains(@class, \'itemtwo\')]', $productRaw[1])->item(1)->nodeValue;

php to extract data from a website

You need first div's p elements only, so your query would be:

$entries2 = $xpath->query('//(div[@class='entry-content'])[1]/p');

Now you can iterate all p elements with foreach() loop (extracting its html contents):

$innerHtml = '';
foreach ($entries2 as $entry) {
    $children = $entry->childNodes;
    foreach ($children as $child) {
        $innerHtml .= $child->ownerDocument->saveXML($child);
    }
}
$innerHtml = str_replace(["\r\n", "\r", "\n", "\t"], '', $innerHtml);

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