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.

Answer 2

A bit of a late answer, but if you just want to determine the word size, you can use this: (log(PHP_INT_MAX + 1, 2) + 1)

Answer 3

if you have the COM extension installed (in php.ini) you can call the windows WMI service.

To check the OS:

function getOsArchitecture() {
    $wmi = new COM('winmgmts:{impersonationLevel=impersonate}//./root/cimv2');
    $wmi = $obj->ExecQuery('SELECT * FROM Win32_OperatingSystem');
    if (!is_object($wmi)) {
        throw new Exception('No access to WMI. Please enable DCOM in php.ini and allow the current user to access the WMI DCOM object.');
    }
    foreach($wmi as $os) {
        return $os->OSArchitecture;
    }
    return "Unknown";
}

or, check the physical processor:

function getProcessorArchitecture() {
    $wmi = new COM('winmgmts:{impersonationLevel=impersonate}//./root/cimv2');

    if (!is_object($wmi)) {
        throw new Exception('No access to WMI. Please enable DCOM in php.ini and allow the current user to access the WMI DCOM object.');
    }
    foreach($wmi->ExecQuery("SELECT Architecture FROM Win32_Processor") as $cpu) {
        # only need to check the first one (if there is more than one cpu at all)
        switch($cpu->Architecture) {
            case 0:
                return "x86";
            case 1:
                return "MIPS";
            case 2:
                return "Alpha";
            case 3:
                return "PowerPC";
            case 6:
                return "Itanium-based system";
            case 9:
                return "x64";
        }
    }
    return "Unknown";
}

Answer 4

I've had luck with bit-shifting, and taking advantage boolean casting.

function is64bit()
{
  return (bool)((1<<32)-1);
}
// or
function is32bit()
{
  return 1<<32 === 1;
}

Answer 5

Note: This solution is a bit less convenient and slower than @Salman A's answer. I would advice you to use his solution and check for PHP_INT_SIZE == 8 to see if you're on a 64bit os.

If you just want to answer the 32bit/64bit question, a sneaky little function like this would do the trick (taking advantage of the intval function's way of handling ints based on 32/64 bit.)

<?php
function is_64bit()
{
    $int = "9223372036854775807";
    $int = intval($int);
    if ($int == 9223372036854775807) {
        /* 64bit */
        return true;
    } elseif ($int == 2147483647) {
        /* 32bit */
        return false;
    } else {
        /* error */
        return "error";
    }
}
?>

You can see the code in action here: http://ideone.com/JWKIf

Note: If the OS is 64bit but running a 32 bit version of php, the function will return false (32 bit)...

Answer 6

Or use PHP COM to call wmi

$obj = new COM('winmgmts://localhost/root/CIMV2');
$wmi = $obj->ExecQuery('Select * from Win32_OperatingSystem');
foreach($wmi as $wmiCall)
{
    $architecture = $wmiCall->OSArchitecture;
}