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@ 2013-03-13T14:56:37Z

<?php
$z="printf";
function x($n) {
    for($i = 1; $i <= $n; $i++) {
    	$n % $i == 0 && $i != $n ? $f[]=$i & $z('$i '): 0;
    }
array_sum($f) == $n ? $z('P') : $z('I');
}

x(28);

Output
Performance
VLD
References
Branches

array_sum: documentation ( source)

preferences:dark modelive preview

31.5 ms | 402 KiB | 5 Q