virt2/assets/vendor_plugins/ace-builds-master/demo/kitchen-sink/docs/php.php

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<?php
function nfact($n) {
if ($n == 0) {
return 1;
}
else {
return $n * nfact($n - 1);
}
}
echo "\n\nPlease enter a whole number ... ";
$num = trim(fgets(STDIN));
// ===== PROCESS - Determing the factorial of the input number =====
$output = "\n\nFactorial " . $num . " = " . nfact($num) . "\n\n";
echo $output;
?>