Online PHP editor | refs for JR4XH

@ 2015-12-13T00:20:54Z

<?php

function silnia($n)
{
    return ($n <= 1) ? 1 : gmp_mul($n, silnia($n-1));
}

$strSilnia = (string)silnia(60);
$zeroCount = 0;
for ($i = strlen($strSilnia)-1; $i >= 0; $i--)
{
    if ($strSilnia[$i] == 0) $zeroCount += 1;
    else break;
}

echo $zeroCount;