Can PHP tell if the server os is 64-bit?

Question

I am dealing with Windows here.

I know you can use the $_SERVER[\'HTTP_USER_AGENT\'] variable to detect the OS of the browser viewing the page, but is t

Answer 1

No need to do calculations. Just check the PHP_INT_SIZE constant:

if(PHP_INT_SIZE>4)
  // 64 bit code
else
  // 32 bit code

The size of integers is a good indicator, but not bulletproof. Someone might run a 32 bit app on a 64 bit system.

$_SERVER['SERVER_SOFTWARE'] and $_SERVER['SERVER_SIGNATURE'] might tell you something useful, depending on the implementation of the server.