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<?php function x($n) { echo "$n'sFactors: "; for($i = 1; $i <= $n; $i++) { if ($n % $i == 0 && $i != $n) { $factors[] = $i; echo "$i "; } } if ($n == array_sum($factors)) { echo "[Perfect]"; } else { echo "[Imperfect]"; } } x(28); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
28'sFactors: 1 2 4 7 14 [Perfect]