You can use sessions to block people from visiting the link directly, though there are of course many ways for them to get around it, but many people don't know how.
getdata on a single file to take in the image id or name, and use
.htaccess to rewrite it to
.jpg, etc. Have a directory structure such as:
- - example.gif
- - funny.jpg
- - interesting.png
view.php checks the session, takes in the
getdata of the image name, it then looks for the file in the files directory and grabs it and then shows the image at the url. So there is one url for them all eg:
Then use the image handling functions to get the type
image/gif and use the
header('Content-type: image/gif') and use PHP's image handling functions to show the image.
The role of
.htaccess is to hide the files directory, you could also use mod rewrite to spoof the image urls where they actually direct to one location. The whole purpose of this is so you can set the session on the main website then show the pictures there but the direct url to the image can show an alternate image describing "direct linking is disallowed" or such.