How to find the extension for a file that doesn't have one

Question

I"m using InkFilePicker to allow my website users to upload Images through my site. Ink uploads it to my Amazon S3 bucket (bless them!) and returns a URL after the upload is complete. Problem is, I want those images stored on my server instead!

OK, so the URL I get back from Ink looks like this:

https://www.filepicker.io/api/file/JNJB5DkqR8C4OAbzXh8z

Yup, no file extension. Pfft .. I'll need to figure out the original file type for this image so that I can assign it a file extension when I save it to my server.

But HOW? It's displayed properly in my browser - so there must be a way!

Answer 1

You can use PHP getimagesize() function

Like this:

$img = getimagesize('https://www.filepicker.io/api/file/JNJB5DkqR8C4OAbzXh8z');

echo $img['mime']; // image/png

If you want to just extract the extension without MIME Type. You can use image_type_to_extension

echo image_type_to_extension($img[2]); // .png