3v4l.org

run code in 150+ 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 - 7.1.0
1 2 4 7 14 I