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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'];
?>


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