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# php_uname

(PHP 4 >= 4.0.2, PHP 5)

php_uname -- Returns information about the operating system PHP was built on

## Description

string php_uname ( void )

php_uname() returns a string with a description of the operating system PHP is built on. If you're just wanting the name of the operating system, consider using the `PHP_OS` constant.

示範 1.Some php_uname() examples
`<?php echo php_uname(); echo PHP_OS; /* Some possible outputs: Linux localhost 2.4.21-0.13mdk #1 Fri Mar 14 15:08:06 EST 2003 i686 Linux FreeBSD localhost 3.2-RELEASE #15: Mon Dec 17 08:46:02 GMT 2001 FreeBSD Windows NT XN1 5.1 build 2600 WINNT */ if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') { echo 'This is a server using Windows!'; } else { echo 'This is a server not using Windows!'; } ?>`

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

示範 2.A few OS related constant examples
`<?php // *nix echo DIRECTORY_SEPARATOR; // / echo PHP_SHLIB_SUFFIX; // so echo PATH_SEPARATOR; // : // Win* echo DIRECTORY_SEPARATOR; // \ echo PHP_SHLIB_SUFFIX; // dll echo PATH_SEPARATOR; // ; ?>`

See also phpversion(), php_sapi_name(), and phpinfo().

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