By: Alex Fraundorf

Hi C.W.,
Thanks for the comment and question. Because there is a direct correlation between the database table’s primary ID and the shortened code, you can simply enter a dummy line with an ID of 125000 into your table. The next row entered by the script will be 125001, which should translate to a 4 digit short code, and you will be able to generate a little over six million short codes before it jumps to 5 digits.
This is of course based on my script. If you are using Brian Cray’s version, your solution will probably need some tweaking, but should be similar.
I hope that answers your question. If not please feel free to follow up here or contact me through my website.
Thanks for reading and happy PHPing!