PHP5中文手册·Gets the value of an environment variable -- 追寻梦想＞编程乐园＞PHP 编程

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'];
?>


	PHP5中文手册 get_required_files getlastmod PHP Options/Info PHP Manual 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']; ?>` 参见 putenv() apache_getenv() Superglobals get_required_files getlastmod PHP Options/Info PHP Manual

getenv

说明

参数

返回值

范例

参见