title: Factorial of 170+
body: <p>everytime I try to get the factorial of 171, I get INF. 170 works fine. Is it possible to get the factorial of 171+ in a script? How?
  My function:</p>
  
  <pre><code>function factorial($n) {
      if ($n == 0) return 1;
      return $n * factorial($n - 1);
  }
  </code></pre>