3v4l.org

run code in 300+ PHP versions simultaneously
<?php function x($n){ for($i=1;$i<$n;$i++){ if($n%$i==0){ $f[]=$i; echo"$i "; } } echo array_sum($f)==$n?"P":"I"; } for($b=1;$b<100000;$b++){ x($b); }

preferences:
35.17 ms | 402 KiB | 5 Q