3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function x($n){for($i=1;$i<=$n;$i++){$n%$i==0&&$i!=$n?$f[]=$i&printf("$i "):0;}printf(array_sum($f)==$n?"P":"I");}x(28);
Output for 4.3.0 - 7.2.0
1 2 4 7 14 I