php-doc-en/reference/info/functions/php-uname.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- splitted from ./en/functions/info.xml, last change in rev 1.7 -->
  <refentry id="function.php-uname">
   <refnamediv>
    <refname>php_uname</refname>
    <refpurpose>
     Returns information about the operating system PHP was built on
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>string</type><methodname>php_uname</methodname>
      <void/>
     </methodsynopsis>
    <simpara>
     <function>php_uname</function> returns a <type>string</type> 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
     <constant>PHP_OS</constant> constant.
    </simpara>
    <para>
     <example>
      <title>Some <function>php_uname</function> examples</title>
      <programlisting role="php">
<![CDATA[
<?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 'You are using Windows!';
} else {
    echo 'You are not using Windows!';
}

?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     There are also some related 
     <link linkend="language.constants.predefined">Predefined PHP
     constants</link> that may come in handy, for example:
    </para>
    <para>
     <example>
      <title>A few OS related constant examples</title>
      <programlisting role="php">
<![CDATA[
<?php
// *nix
echo DIRECTORY_SEPARATOR; // :
echo PHP_SHLIB_SUFFIX;    // so

// Win*
echo DIRECTORY_SEPARATOR; // ;
echo PHP_SHLIB_SUFFIX;    // dll
?>
]]>
      </programlisting>
     </example>
    </para>
    <para>
     See also <function>php_version</function>, 
     <function>php_sapi_name</function>, and 
     <function>phpinfo</function>.
    </para>
   </refsect1>
  </refentry>

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