PHP function getenv Introduction and usage examples _php tutorial

Getenv (PHP 4, PHP 5)
Copy CodeThe code is as follows://getenv-Gets the value of an environment variable

Function Description:
String getenv (String $varname)
Copy the Code Code as follows://Gets the value of an environment variable.
With Phpinfo () you can see a list of all the environment variables.

Parameter description:
Copy the Code code as follows: $varname variable name.

function return value:
Copy the Code Code as follows://Returns the value of the environment variable varname, or FALSE if the environment variable varname does not exist.

Function Application Example:
The copy Code code is as follows: //getenv () Use example
$ip = getenv (' remote_addr ');

Or simply use global variables ($_server or $_env)
$ip = $_server[' remote_addr ');
?>

Through Phpinfo can see the entire PHP environment configuration information, then want to get one of the variable information to do?
Below is actually shown below, for example I want to get the following information:

So, the source code for PHP is:
Copy the Code code as follows: Echo getenv (' userprofile ');//C:\Windows\system32\config\systemprofile

Easy, huh? Hey ~

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