[SOLVED] Search 5/10/15 miles from {Zip Code}

[Northern Flame]

I know how to make search scripts in PHP,

but can someone help me with making a script that will search for certain

database entries that are either 5 10 or 15 miles from a zip code?

Im guessing im going to have to have a huge list of zip codes in a database.

hopefully i can find something on google with a huge list of zip codes, but

if i end up getting a big list of zip codes, how can i search the locations in my

database that are a certain distance from those zip codes? or do I even need a

database full of zip codes? is there an easier way?

if someone can help me out with this or show me a tutorial on this I would greatly

appreciate it!