Basic US zipcode Script

Find all the zipcodes in a radius of x miles from a another zipcode, or find the distance between two zipcodes. The script uses the most up-to-date database provided by the U.S government with 42,000+ records. Using it is as simple as calling a PHP function. This program was written with simplicity in mind. It is very easy to use and install. I have even included a working example. This script can be used alone or easily integrated with other projects such as a store locater.