[PHP] Code Structure/Errors

I'm just curious if there's a way to restructure my code so as to avoid getting Undefined Variable errors. I keep getting them and I know they're nothing to worry about for the most part, I'd like to get rid of them without turning off error reporting if possible. In the following code, I get an

Re: [PHP] Code Structure/Errors

Quick soln. is to put a symbol in front of the error generating line. E.g.@$i++; actual soln. would be to do some initialization like $i = 0; outside your while loop and $last_name=; I'm just curious if there's a way to restructure my code so as to avoid getting Undefined Variable errors. I