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.

better to also validate the extension is correct for the file, using mime_content_type() — sivann, May 14 '16 at 18:27

score 5 · Accepted Answer · edited May 14 '16 at 17:50

5

I found the solution myself.

exif_imagetype($image_url);

which will output the mime type for validation.

edited May 14 '16 at 17:50

Michael Gaskill

answered May 13 '16 at 18:49

Jordyn

score 4 · Answer 2 · answered May 13 '16 at 21:04

You can use preg_match to compare the filename to the known list:

if (preg_match('/\.(jpeg|jpg|png|gif)$/i', $image_url)) {
    // Successful match!
} else {
    // Not an image file extension
}

This will match a string that ends in a '.jpeg', '.jpg', '.png', or '.gif', whether they're uppercase, lowercase, or mixed case.

2 Answers2