question from newbie

Hi people, Im quite new to the list. I am trying to construct a php script that will take a string submitted from a web site, break it up into keywords and add to an array, then perform a query to a mysql db for each keyword in the array. It will then send the result to the browser. the script is complete so far as I have added the functions to get the string from the web site, explode it and add it to an array, but i'm having trouble putting together a loop that will do a new query for every keyword in the array. is anyone able to help me with an example of a loop which could work for me? any help very much apreciated :) Chris Barnes