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'];
?>
