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@ 2015-10-06T21:59:44Z

<?php
declare(strict_types=1);

function isPerfect($n) {
	return count($n)==4&&$n[0]*$n[1]*$n[2]*$n[3]+1==pow(pow($n[0],2)+3*$n[0]+1,2);
}

var_dump(isPerfect(['a','b','c','d']));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
pow: documentation ( source)

preferences:dark modelive preview

36.55 ms | 402 KiB | 5 Q