3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function x($n){for($i=1;$i<$n;$i++){if($n%$i==0){$f[]=$i;echo"$i ";}}printf(array_sum($f)==$n?"P":"I");}x(28);
Output for 4.3.0 - 7.1.0
1 2 4 7 14 P