On Linux, use the command `hostname` to view your host name, or `sudo hostname servername` to set it
(PHP 5 >= 5.3.0, PHP 7)
gethostname — 获取主机名
gethostname() 可以获取本地机器的标准主机名。
成功时返回主机名称字符串，失败时返回 FALSE。
Example #1 简单的 gethostname() 例子
<?php
echo gethostname(); // may output e.g,: sandie
// Or, an option that also works before PHP 5.3
echo php_uname('n'); // may output e.g,: sandie
?>
On Linux, use the command `hostname` to view your host name, or `sudo hostname servername` to set it