Hexadecimal XOR with 2 values in PHP and JavaScript

Question

I can't find the solution for very easy question.

Code in JavaScript:

var x = -1 ^ 0xF00F9344;

In this case x value is 267414715

Code in PHP:

$x = -1 ^ 0xF00F9344;

The result is -4027552581

Any idea, how to get 267414715 (correct) result in PHP?

Yes, works here too. What version of PHP do you have? and on what hardware? — Dan Bizdadea
– Dan Bizdadea, Commented Sep 19, 2011 at 9:54
Works for me on a 32bit machine, but I get the same beaviour on a 64bit machine. — Toto
– Toto, Commented Sep 19, 2011 at 10:08

user187291 · Accepted Answer · 2011-09-19 10:09:14Z

4

While javascript bit operations are always 32-bit, php depends on the platform's word size:

on a 32-bit platform

$n    = "11110000000011111001001101000100"
-1^$n = "00001111111100000110110010111011"  = 267414715

on a 64 bit platform

$n    = "0000000000000000000000000000000011110000000011111001001101000100"
-1^$n = "1111111111111111111111111111111100001111111100000110110010111011" = -4027552581

answered Sep 19, 2011 at 10:09

user187291

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