You can do the following things to achieve this :

1. Create php script to upload image and then save it to your webserver. 2. Save the names of the photo in the database with a single random string to identify the photos. 3. Read this random string to identify and display the images (or create a download link for the images) 4. Share this URL with your friends.

Its just my opinion, I am looking for what other have to say.