Retrieve image orientation in PHP

Question

How can I get the image orientation (landscape or portrait) of an image (JPEG or PNG) in PHP?

I created a php site where users can upload pictures. Before I scale them

Answer 1

I use a generalized scaling down algorithm like . ..

   function calculateSize($width, $height){

            if($width <= maxSize && $height <= maxSize){
                $ratio = 1;
            } else if ($width > maxSize){
                $ratio = maxSize/$width;
                } else{
                    $ratio = maxSize/$height;
                    }

        $thumbwidth =  ($width * $ratio);
        $thumbheight = ($height * $ratio);
        }

Here max size is the one I initialized to something like 120px for both height and width . . . so that the thumbnail does not exceed that size . . ..

This Works for me which is irrespective of landscape or portrait orientation and can be applied generally