The 404handler takes the input from URL and if it not found then checks the database and redirects if found or returns to a 404 error page (configurable)
Key benefits: Works with most sites, centralize management of shortlinks, 8 character unique ID generated,
option: only one URL per id! or allow repeats for multiple tracking.
You can admin ( add, change delete) shortlinks via the admin page
For more informaiton about this PHP script to handle 404 errors and shortlinks plase see : this page