Modify PHP coding

I require someone to modify some coding that i already have for displaying information from a SQL database.

Coding has already been produced on another page where the address fields are displayed on lines using line breaks and it has been set up so that there is no blank space left if there is no data present in that particular database column i.e the information moves up a line.

The code i want producing / changing must be modified so that the information from the database is displayed on a line with commas separating the relevant data i.e address1, address2, county, post code. If no data is present in the database then the information moves along i.e address1, county, post code.

The coding that has been used on one page on my site is as follows:
$f3=mysql_result($result,$i,"address1");



I can't work out how to modify this code as the information is displayed differently on the output page so need some help: