PHP Master | Understanding Recursion

Start-Process powershell.exe -verb runAs -ArgumentList '-NoExit', '-Command', 'cd D:\folder'

composer self-update --1

<?php
function factorial ($number, $factorial = 1) {
    if ($number < 0) {
        throw new InvalidArgumentException('Number cannot be less than zero (0)');
    }
    if ($number == 0) {
        return $factorial;
    }
    else {
        return factorial($number - 1, $factorial * $number);
    }
}