PHPQuery - getting the image width and height

Question

I am parsing a page using PHPQuery.

At some point I have obtained all images on the page using:

$url = "http://mywebsite.com";
$all = phpQuery::newDocumentFileHTML($url, $charset = 'utf-8');

// list of all images
$imgsrc = $all->find('img'); 

now I am interacting this list

foreach ($imgsrc as $img) {

   $width  = need magic command to extract image width
   $height = need magic command to extract image height

}

The problem is this. The img attribute does not have a width or a height attribute but its class has.

The image tag is like this:

<img src="img1.png" class="alfa">

I need to get the width and height defined by that class.

I can get the class name by doing

$className = pq($img)->attr('class');

How do I do obtain the width/height of that class now?

Answer 1

list($width, $height, $type, $attr) = getimagesize("img/flag.jpg");

to get the image height and width.