PHP's getimagesize() returns an array of data. The first two items in the array are the two items you're interested in: the width and height. To get these, you would simply request the first two indexes in the returned array:
var $imagedata = getimagesize("someimage.jpg");
print "Image width is: " . $imagedata[0];
print "Image height is: " . $imagedata[1];
imageCreateFromPNG($var);
//I don't know where from you get your image, here it's in the png case
// and then :
list($width, $height) = getimagesize($image);
echo $width;
echo $height;
getimagesize('image.jpg')
function works only if allow_url_fopen is set to 1 or On inside php.ini file on the server,
if it is not enabled, one should use
ini_set('allow_url_fopen',1);
on top of the file where getimagesize() function is used.