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(PHP 4 >= 4.0.2, PHP 5)

php_unameReturns information about the operating system PHP is running on


string php_uname ([ string $mode = "a" ] )

php_uname() returns a description of the operating system PHP is running on. This is the same string you see at the very top of the phpinfo() output. For the name of just the operating system, consider using the PHP_OS constant, but keep in mind this constant will contain the operating system PHP was built on.

On some older UNIX platforms, it may not be able to determine the current OS information in which case it will revert to displaying the OS PHP was built on. This will only happen if your uname() library call either doesn't exist or doesn't work.



mode is a single character that defines what information is returned:

  • 'a': This is the default. Contains all modes in the sequence "s n r v m".
  • 's': Operating system name. eg. FreeBSD.
  • 'n': Host name. eg.
  • 'r': Release name. eg. 5.1.2-RELEASE.
  • 'v': Version information. Varies a lot between operating systems.
  • 'm': Machine type. eg. i386.


Returns the description, as a string.


Example #1 Some php_uname() examples

echo php_uname();

if (strtoupper(substr(PHP_OS03)) === 'WIN') {
'This is a server using Windows!';
} else {
'This is a server not using Windows!';


There are also some related Predefined PHP constants that may come in handy, for example:

Example #2 A few OS related constant examples

// *nix
echo PHP_SHLIB_SUFFIX;    // so
echo PATH_SEPARATOR;      // :

// Win*
echo PHP_SHLIB_SUFFIX;    // dll
echo PATH_SEPARATOR;      // ;


  • phpversion() - Gets the current PHP version
  • php_sapi_name() - Returns the type of interface between web server and PHP
  • phpinfo() - Outputs information about PHP's configuration

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