How to construct a multiple condition statement in PHP [on hold]

I'm a newbie. What is the best way to construct a multiple condition statement and finding the output for each possible condition? This reminds me of learning binary data.

if ( empty($a) && empty($b) && !empty($c) ) {

} elseif ( empty($a) && !empty($b) && empty($c) ) {

} elseif ( empty($a) && empty($b) && !empty($c) ) {

}
...
...
..

Is using if-then-else the best solution?