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@ 2013-03-13T17:07:43Z

<?php
function x($n){
    for($i=1;$i<$n;$i++){
        !$n%$i ? $f[]=$i:0;
    }
    echo array_sum(@$f)==$n?"P":"I";
}
    x(28);

Output
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array_sum: documentation ( source)

preferences:dark modelive preview

33.96 ms | 402 KiB | 5 Q