Check whether remote URL has a valid image extension

Question

How can I check that a remote URL has a valid image extension?

What I want to do is upload images via link using PHP

copy('http://website.com/image.jpg', '/upload/filename.jpeg');

Code works fine but i want to check whether entered url has a valid image extension.

It should be jpg, png or gif file. Love to see a example of how to do this.

Your help and time is highly appreciated.

Answer 1

I found the solution myself.

exif_imagetype($image_url);

which will output the mime type for validation.