$opt_a   = 1;   # this is option a
$obt_hoo = 1;   # this is option b

##</code><code>##

if (
	condition 1
	&& condition 2
	&& condition 3
	...
) {
	code to be executed
} #/ short desc of if code, if needed.
else {
	else-block code
} #/ short desc of else code, if needed.