Is there a PHP function or variable giving the local host name?

When a script runs under Apache, I insert $_SERVER['SERVER_NAME'] value into an error reporting e-mail message.

However, if a Web script forks a "worker" job with nohup php ..., $_SERVER['SERVER_NAME'] appears to be empty there. Thus, if an error occurs, it's reported without a host name.

Can I reliably get the host name by means of PHP, without calling Unix hostname command?

From stackoverflow Ivan Krechetov

• php_uname("n")

  From Prody

• You can use _GLOBALS['MACHINENAME'] to obtain the information straight from the globals array.

  From $pageUsers[$post.author].name