php_uname()

(PHP 4 >= 4.0.2, PHP 5, PHP 7)

返回运行 PHP 的系统的有关信息

说明

php_uname()返回了运行 PHP 的操作系统的描述。这和phpinfo()最顶端上输出的是同一个字符串。如果仅仅要获取操作系统的名称。可以考虑使用常量PHP_OS，不过要注意该常量会包含 PHP 构建（built）时的操作系统名。

在一些旧的 UNIX 平台，它有可能无法检测到当前系统的信息，然后会还原显示成构建 PHP 时的系统信息。这仅仅在你的 uname()函数库不存在或无法运行时发生。

参数

$mode是单个字符，用于定义要返回什么信息：

• 'a'：此为默认。包含序列"s n r v m"里的所有模式。
• 's'：操作系统名称。例如：FreeBSD。
• 'n'：主机名。例如：localhost.example.com。
• 'r'：版本名称，例如：5.1.2-RELEASE。
• 'v'：版本信息。操作系统之间有很大的不同。
• 'm'：机器类型。例如：i386。

返回值

返回描述字符串。

范例

一些php_uname()的例子

同样可以方便地使用一些相关的PHP 预定义常量，例如：

一些系统相关常量的例子

参见

• phpversion() 获取当前的PHP版本
• php_sapi_name() 返回 web 服务器和 PHP 之间的接口类型
• phpinfo() 输出关于 PHP 配置的信息

Note that PHP won't tell you that it reverted to displaying platform it was built on.

Note that php_uname('n') does not always equal $_SERVER['HOST_NAME']
The machine that you are running the script may server many different host names so don't use this when building urls.

Although it does not indicate receiving parameters this function allows some chars as parameters, they are the options a; m; n; r; s; v.
I don't know exactly what each one does, but below is a code example and its output on PHP 5.5 running on RedHat 4.4

Note that I used file_get_contentes with a file, that file is present in most linux boxies and varies on content, but most of times it indicates kernel version, linux version, distribution and so on. In my case my user didn't have access to the file, so to identify that it was a red hat I paid attention to php_info outputs, there in the middle was the postgress driver description, p. eg indicating the distribution.
I guess there is no easy way to find out the server version programmatically a 100% of times, but by and large you can get around by yourself.

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