PHP script - detect whether running under linux or Windows?

04/07/2020 03:30:02

I have a PHP script that may be placed on a windows system or a linux system. I need to run different commands in either case.

How can I detect which environment I am in? (preferably something PHP rather than clever system hacks)


To clarify, the script is running from the command line.

Verified Answer (223 Votes)

05/04/2011 10:40:15

Check the value of the PHP_OS constantDocs.

It will give you various values on Windows like WIN32, WINNT or Windows.

See as well: Possible Values For: PHP_OS and php_unameDocs:

if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
    echo 'This is a server using Windows!';
} else {
    echo 'This is a server not using Windows!';

Answer #2 (60 Votes)

05/04/2011 10:39:22

You can check if the directory separator is / (for unix/linux/mac) or \ on windows. The constant name is DIRECTORY_SEPARATOR.

    // unix, linux, mac

    // windows

Answer #3 (18 Votes)

02/05/2013 18:12:32

Note that PHP_OS reports the OS that PHP was built on, which is not necessarily the same OS that it is currently running on.

If you are on PHP >= 5.3 and just need to know whether you're running on Windows or not-Windows then testing whether one of the Windows-specific constants is defined may be a good bet, e.g.:

$windows = defined('PHP_WINDOWS_VERSION_MAJOR');
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