Checking if your code is running on 64-bit PHP

Question

Does anyone know of a way of checking within PHP if the script is running as either 32-bit or 64-bit? Currently I\'m using PHP 5.3.5.

Ideally I\'d like to write a f

Answer 1

A short way to get the number of bits.

    strlen(decbin(~0));

How this works:

The bitwise complement operator, the tilde, ~, flips every bit.

@see http://php.net/manual/en/language.operators.bitwise.php

Using this on 0 switches on every bit for an integer.

This gives you the largest number that your PHP install can handle.

Then using decbin() will give you a string representation of this number in its binary form

@see http://php.net/manual/en/function.decbin.php

and strlen will give you the count of bits.

Here is it in a usable function

function is32Bits() {
    return strlen(decbin(~0)) == 32;
}