PHP / mySQL和Google Maps Geocoding

Basically what I have is a sql database with various data points in it (name, email, etc.) and importantly fields that contain addresses. What I am attempting to do is use these addresses (possibly just the zip codes?) to plot pins on a google map with their geocoding system. I know that i need to collect all of the zips from the database in an array and do some sort of foreach for every zip but I am unsure of how to do this. Here is what I have so far, can anyone help me? Basically what I have is a sql database with va