Simple PHP URL shortener

1. Download the source code as located within this repository, and upload it to your web server.
2. Use database.sql to create the redirect table in a database of choice.
3. Edit config.php and enter your database credentials.
4. If you don't provide an auth.token file, the system will generate one automatically the first time it is used.

You can get the code for the included favelet by executing mkfavelet.php on your servers shell, or if you don't have access to a shell on your server, get the contents of auth.token and fill them into the following scriptlet:

javascript:(function(){var%20d=document;window.open('<SHORTENER_URL>favelet.php?token=<AUTH_TOKEN>&url='+encodeURIComponent(d.location)+'','_blank','width=480,height=70,menubar=no,toolbar=no,status=no,location=no');})();

Which than can be used as favelet in your favorite browser.

• Uses a simple token authentication when accessing the shortener
• Redirect to Twitter when given a numerical slug, e.g. http://mths.be/8065633451249664 → http://twitter.com/mathias/status/8065633451249664.
• Redirect to your main website when no slug is entered, e.g. http://mths.be/ → http://mathiasbynens.be/.
• Redirect to a specific page on your main website when an unknown slug (not in the database) is used, e.g. http://mths.be/demo/jquery-size → http://mathiasbynens.be/demo/jquery-size.
• Ignores weird trailing characters (!, ", #, $, %, &, ', (, ), *, +, ,, -, ., /, @, :, ;, <, =, >, [, \, ], ^, _, {, |, }, ~) in slugs — useful when your short URL is run through a crappy link parser, e.g. http://mths.be/aaa) → same effect as visiting http://mths.be/aaa.
• Generates short URLs using base 36 characters.
• Doesn’t create multiple short URLs when you try to shorten the same URL. In this case, the script will simply return the existing short URL for that long URL.
• DRY, minimal code.
• Correct, semantic use of the available HTTP status codes.
• Can be used with Twitter for iPhone. Just go to Settings › Services › URL Shortening › Custom… and enter http://yourshortener.ext/shorten?token=<AUTH_TOKEN>&url=%@.

• — Mathias for the basic implementation