Interestingly, the GNU convention is "When you split an expression into multiple lines, split it before an operator, not after one." but GNU style apparently does not treat commas as operators — those are still left at the end of a line.

if (($foo && $bar && ...)
    || ($baz && $quux && ...)) {
  ...
}

# but

function_call_with_many_lengthy_args
  (very_long_arg1,
   very_long_arg2,
   and_on_and_on_and_on);
[download]

GNU style is specifically for C, but Perl syntax is reasonably similar. I suppose the point is that this really is a matter of style, except in Awk, where if I remember correctly, an operator at the end of a line also implies line continuation; the GNU convention requires backslash-newline in Awk.