PHP Integer size

How to tell how big your php integers are:

<?php

  $one = 1;
  $big = 4294967297;

  $mod = sprintf("%u", $big);

  $a = ( $one == $mod ) ? 64 : 32;

  echo $a. "\n";

?>

Tested on 32 and 64 bit builds of PHP 4.4.1 on Solaris 8 (SPARC).