PHP One Time URL: Generate URL that only works one time for the user

This class can generate URL that only works one time for the user.

It takes a given URL and stores it in session variables.

The class returns an obfuscated URL using a random key generated by the class that is also stored in session variables.

It can also retrieve the URL retrieving its key from the current request URL.

The class removes the URL and keys from the session variables, so the one time URL does not work anymore.

Applications should redirect the user to the real page URL when the user accesses the one time URL page.