How to scrape html contents of one div by id using php - php

Question

The page on another of my domains which I'd like to scrape one div from contains:
<div id="thisone">
<p>Stuff</p>
</div>
<div id="notthisone">
<p>More stuff</p>
</div>
Using this php...
<?php
$page = file_get_contents('http://thisite.org/source.html');
$doc = new DOMDocument();
$doc->loadHTML($page);
foreach ($doc->getElementsByTagName('div') as $node) {
echo $doc->saveHtml($node), PHP_EOL;
}
?>
...gives me all divs on http://thisite.org/source.html, with html. However, I only want to pull through the div with an id of "thisone" but using:
foreach ($doc->getElementById('thisone') as $node) {
doesn't bring up anything.

Answer 1

$doc->getElementById('thisone');// returns a single element with id this one
Try $node=$doc->getElementById('thisone'); and then print $node
On a side note, you can use phpQuery for a jquery like syntext: pq("#thisone")

Answer 2

$doc->getElementById('thisone') returns a single DOMElement, not an array, so you can't iterate through it
just do:
$node = $doc->getElementById('thisone');
echo $doc->saveHtml($node), PHP_EOL;

Answer 3

Look at PHP manual http://php.net/manual/en/domdocument.getelementbyid.php
getElementByID returns an element or NULL. Not an array and therefore you can't iterate over it.
Instead do this
<?php
$page = file_get_contents('example.html');
$doc = new DOMDocument();
$doc->loadHTML($page);
$node = $doc->getElementById('thisone');
echo $doc->saveHtml($node), PHP_EOL;
?>
On running
php edit.php you get something like this
<div id="thisone">
<p>Stuff</p>
</div>