get_required_files
SERVER_NAME is the name defined in the apache configuration.
HTTP_HOST is the host header sent by the client when using the more recent versions of the http protocol.
getenv
(PHP 4, PHP 5)
getenv — Gets the value of an environment variable
说明
string getenv
( string $varname
)
Gets the value of an environment variable.
You can see a list of all the environmental variables by using phpinfo(). You can find out what many of them mean by taking a look at the » CGI specification, specifically the » page on environmental variables.
参数
- varname
-
The variable name.
返回值
Returns the value of the environment variable varname , or FALSE on an error.
范例
Example#1 getenv() Example
<?php
// Example use of getenv()
$ip = getenv('REMOTE_ADDR');
// Or simply use a Superglobal ($_SERVER or $_ENV)
$ip = $_SERVER['REMOTE_ADDR'];
?>
add a note
User Contributed Notesgetenv
sam at sambarrow dot com
12-Mar-2008 06:32
12-Mar-2008 06:32
renko at <remove>virtual-life dot net
08-Nov-2004 06:40
08-Nov-2004 06:40
The function 'getenv' does not work if your Server API is ASAPI (IIS).
So, try to don't use getenv('REMOTE_ADDR'), but $_SERVER["REMOTE_ADDR"].
kyong
04-Feb-2004 01:06
04-Feb-2004 01:06
As you know, getenv('DOCUMENT_ROOT') is useful.
However, under CLI environment(I tend to do quick check
if it works or not), it doesn't work without modified php.ini
file. So I add "export DOCUMENT_ROOT=~" in my .bash_profile.
daman at SPAM_BlockERmralaska dot com
08-Sep-2002 06:37
08-Sep-2002 06:37
Be careful using HTTP_X_FORWARDED_FOR in conditional statements collecting the IP address. Sometimes the user's LAN address will get forwarded, which of course is pretty worthless by itself.
alex at acid-edge dot net
23-Jul-2002 10:32
23-Jul-2002 10:32
Note that some caches seem to send the client-ip header *backwards*. be careful :)
john-php at pc dot xs4all dot nl
15-Aug-2000 06:56
15-Aug-2000 06:56
Note that the X-Forwarded for header might contain multiple addresses, comma separated, if the request was forwarded through multiple proxies.
Finally, note that any user can add an X-Forwarded-For header themselves. The header is only good for traceback information, never for authentication. If you use it for traceback, just log the entire X-Forwarded-For header, along with the REMOTE_ADDR.