Try using eval. I've done this with function names before. Your code will look like:

I'm trying to do something like this:
my @fee;
for (my $i=0; $i < $MAX_ROWS; $i++){
   my $eval_str = "push @fee, \$foo_$i";
   eval($eval_str);
}#end loop
[download]

Here I create the command I want to execute as a string and then evaluate it with eval.
UPDATE: I just saw dragonchild's comments and realized that my method probably wouldn't be safe for web applications. The eval would be dangerous, so use at your own risk.