Debug a Domdocument Object in PHP

How to Debug seemingly empty DOM objects?

For a DomDocument I var_dump using the xml output.

var_dump($dom->saveXML());

For a DOMElement, I use (as seen here):

var_dump($domElement->ownerDocument->saveXML($domElement));

But DOMNodeList, I have no idea. Maybe you have to attach/append it to a DomDocument, and then var_dump it.

And btw, not showing internals of a DomDocument is reported (here: Reflection).

Debugging of object of DOMXPath and DOMDocument

This is a bug:

Bug #48527: DOM XML classes do not expose properties to Reflection

For some reason, DOM* classes do not expose their properties, neither to Reflection, nor to any other function capable of inspecting objects. You'd have to write a custom inspector that collects the properties manually.

Trying to get values from a html page with PHP DOMDocument

This is what I have got to work from your code so far...

$doc = new DOMDocument();

$doc->validateOnParse = true;
$doc->preserveWhiteSpace = false;
$doc->loadHTML($page);

$ReadIDMapsRow = ['column1_name' => 'CAR', 'column1_id' => 'car7'];

$Column1Name = $ReadIDMapsRow['column1_name'];
$Column1Value = $doc->getElementById($ReadIDMapsRow['column1_id']);
$Column1ValueText =  $Column1Value->textContent;

echo $Column1Name.PHP_EOL;
echo $Column1ValueText.PHP_EOL;

which gives...

CAR
90

how to get a raw from a DOMNodeList

DOMNodeList::item() will give a DOMNode in the DOMNodeList by index. For example, to get the first node in the list:

$dom->getElementsByTagName('url')->item(0)

To get the actual data that the element contains, use code something like this:

if ($node = $dom->getElementsByTagName('url')->item(0)) {
  $url = $node->nodeValue;
} else {
  // Element does not exist, handle error here
}

Get entire BODY content using PHP DOM DOCUMENT

You can pass the body DOMElement to either DOMDocument::saveHTML() or DOMDocument::saveHTMLFile(), e.g.

<?php
$doc = new DOMDocument;
$doc->loadhtmlfile('http://stackoverflow.com');

$body = $doc->getElementsByTagName('body');
if ( $body && 0<$body->length ) {
    $body = $body->item(0);
    echo $doc->savehtml($body);
}

prints

Warning: DOMDocument::loadHTMLFile(): Unexpected end tag : p in http://stackoverflow.com, line: 2843 [...]
<body class="home-page">
<noscript><div id="noscript-padding"></div></noscript>
<div id="notify-container"></div>
<div id="overlay-header"></div>
<div id="custom-header"></div>
<div class="container">
        <div id="header">
            <div id="portalLink">
[...]

Can't Load And Parse DOM Object

This is an example from the manual: DOMDocument

<?php 
$content = file_get_contents("http://www.example.com/example.php");
$xml = new DOMDocument();
$xml->loadHTML($content);

// Empty array to hold all links to return
$links = array();

//Loop through each <a> tag in the dom and add it to the link array
foreach($xml->getElementsByTagName('a') as $link) {
    $links[] = array('url' => $link->getAttribute('href'), 'text' => $link->nodeValue);
}

print_r($links);
?>