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<?php function x($n) { for($i = 1; $i <= $n; $i++) { if ($n % $i == 0 && $i != $n) { $factors[] = $i; echo "$i is a factor of $n." . PHP_EOL; } elseif ($i == $n) { echo "Removing $n from array.."; } } var_dump($factors); $a = array_unique($factors); var_dump($a); echo "Removing duplicate factors."; return ($n == array_sum($a) / 2) ? true : false; } x(42); ?>
Output for 4.3.10 - 4.4.9, 5.0.2 - 7.1.0
1 is a factor of 42. 2 is a factor of 42. 3 is a factor of 42. 6 is a factor of 42. 7 is a factor of 42. 14 is a factor of 42. 21 is a factor of 42. Removing 42 from array..array(7) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(6) [4]=> int(7) [5]=> int(14) [6]=> int(21) } array(7) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(6) [4]=> int(7) [5]=> int(14) [6]=> int(21) } Removing duplicate factors.
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/kv09V on line 6 1 is a factor of 42.PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/kv09V on line 6 2 is a factor of 42.PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/kv09V on line 6 3 is a factor of 42.PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/kv09V on line 6 6 is a factor of 42.PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/kv09V on line 6 7 is a factor of 42.PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/kv09V on line 6 14 is a factor of 42.PHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/kv09V on line 6 21 is a factor of 42.PHP_EOLRemoving 42 from array..array(7) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(6) [4]=> int(7) [5]=> int(14) [6]=> int(21) } array(7) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(6) [4]=> int(7) [5]=> int(14) [6]=> int(21) } Removing duplicate factors.