Question

I’ve seen this somewhere, but can’t seem to remember. How can I use getimagesize() to return the file type?

$url = (POST_IMAGESELECTOR);
$path_parts = pathinfo($url);
   if ($path_parts !='') {
     $extension = $path_parts['extension'];
     } else {
        $extension = getimagesize($url);
     }

Answer 1

Given the documentation, getimagesize return an array of 7 values.

The one you can use are:

Index 2 is one of the IMAGETYPE_XXX constants indicating the type of the image.

And / Or:

mime is the correspondant MIME type of the image. This information can be used to deliver images with the correct HTTP Content-type header