How to find the extension of an image from path in PHP?

Question

Is there any standard function in PHP to find only extension of an image from the corresponding file path?

For example ff my image path is like \'/testdir/dir2/image

Answer 1

$ext = pathinfo(
    parse_url('/testdir/dir2/image.gif?foo=bar', PHP_URL_PATH), 
    PATHINFO_EXTENSION
); //$ext will be gif