getenv Gets the value of an environment variable


getenv

(PHP 4, PHP 5)

getenvGets 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(). Many of these variables are listed within » RFC 3875, specifically section 4.1, "Request Meta-Variables".

参数

varname

The variable name.

返回值

Returns the value of the environment variable varname, or FALSE if the environment variable varname does not exist.

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'];
?>

参见

  • putenv() - Sets the value of an environment variable
  • apache_getenv() - Get an Apache subprocess_env variable
  • Superglobals


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