Someone

		for ($a = 1, $f = $n; $f > 1; $f--)
		{
			$a *= $f; 
		}
		for ($k = 1, $r = $n; $r > 1; $r--)
		{
			$k *= $r; 
		}
		for ($m = 1, $o = $n; $o > 1; $o--)
		{
			$m *= $o; 
		}