<? if ($a > $b) { print "a is bigger than b"; $b = $a; } ?>
<? if ($a > $b) { print "a is bigger than b"; } else { print "a is NOT bigger than b"; } ?>
<? if ($a > $b) { print "a is bigger than b"; } elseif ($a == $b) { print "a is equal to b"; } else { print "a is smaller than b"; } ?>