3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function x($n){for($i=1;$i<=$n;$i++){if($n%$i==0&&$i!=$n){$f[]=$i;echo"$i ";}}array_sum($f)==$n?printf('P'):printf('I');}x(28);
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
1 2 4 7 14 P