Extracting image height and width

[timbr8ks]

Is there a way to extract the height and width of an uploaded image?

So, I'm uploading an image called link_on. Can I determine its length and height just by reading the file so that I can store those attributes in the database?

[leatherback]

Yes:

Use

$size = getimagesize('filename');
$width = $size[0];
$height = size[1];