PHP URL Shortener

Based on PHP-URL-Shortener by Brian Cray (now abandoned), this app provides a simple but powerful PHP+MySQL based URL shortener.

Benefits

Can shorten over 42 billion unique URLs in 6 or less characters (it can do more than 12,000,000 in only 4!)
Extremely fast: uses very little server resource
Minimalist front end: make it your own
Includes an API so you can create your own short URLs on the fly
Option to turn clickthru tracking on and off
Option to limit usage to 1 IP address for personal use and to prevent spamming from others
Only uses alphanumeric characters so all browsers can interpret the URL
Secure: several data filters in place to prevent SQL injection hacks
Option to check if the URL is real (doesn’t respond with a 404) before shortening
Uses 301 redirects for SEO and analytics
Option to store a local cache to prevent database queries on every redirect
Option to change the characters allowed in a shortened url

Make sure your server meets the requirements: a) Optionally you can run this from your current domain or find a short domain b) Apache (latest) c) PHP (latest) d) MySQL (latest) e) Access to run SQL queries for installation
Download or clone the PHP URL shortener script to your web server
Update the database info in config.php
Run the SQL included in shortenedurls.sql
Rename rename.htaccess to .htaccess

To manually shorten URLs open in your web browser the location where you uploaded the files
To programmatically shorten URLs with PHP use the following code: $shortenedurl = file_get_contents('http://yourdomain.com/shorten/?longurl=' . urlencode('http://' . $_SERVER['HTTP_HOST'] . '/' . $_SERVER['REQUEST_URI']));