Array Sorting Help

Before I begin I must admit I am a bit new to arrays so please be gentle. Here is my situation: I am building an app that queries the database and brings back a result set. This resultset contains last name, first name and id. I am then using the "similar_text" function to weed out only those matches that fall within a ceratin percentage point...and then placing them into an array...right now I'm only using a flat indexed array so the array looks like this : $matchArray[0] = lastname1 $matchArray[1] = firstname1 $matchArray[2] = numberOfCharsMatch1 $matchArray[3] = percentageMatch1 $matchArray[4] = lastname2 etc... What I would like to do is to sort the results based on the "percentageMatch" Obviously my simple flat array will not do the trick. I have read about multidimensional arrays but to be honest I'm having a hard time wrapping my grey matter around how to put it into effect here. How can I go about A) setting up the array correctly...and B) sorting it correctly? Thanks a ton! Ron