Podi scene ekak tienne, output eka 3, 20 | 6, 36 ne.
$b = swap($a, $a); mekedi $b wenne [ (3 + 1)(3+2) ] = 20; $a = 3 nisa
$b = swap(&$a, &$a); mekedi $a function ekata pass karala tienne by reference, a kianne function eka atule mokak hari wenasak karot $a ta, eka original $a ta balapanawa...