I can't reproduce the PHP example:

  $ uname -p
  x86_64
  $ php -v
  PHP 5.4.6-1ubuntu1 (cli) (built: Aug 22 2012 21:13:52)
  Copyright (c) 1997-2012 The PHP Group
  Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
  $ php -r 'var_dump(1000000 * 8.2);'
  float(8200000)
  $