What does PHP's print_r($_SERVER) output?

<?php
print_r($_SERVER);
/*
THE ABOVE CODE OUTPUTS:
Array
(
    [HTTP_HOST] => localhost:8888
    [HTTP_USER_AGENT] => Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:11.0) Gecko/20100101 Firefox/11.0
    [HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;
    [HTTP_ACCEPT_LANGUAGE] => en-us,en;q=0.5
    [HTTP_ACCEPT_ENCODING] => gzip, deflate
    [HTTP_CONNECTION] => keep-alive
    [HTTP_REFERER] => http://localhost:8888/?m=settings!subscription!upgrade
    [HTTP_COOKIE] => __utma=111872281.1314222649.1332850396.1335657071.1335660029.147
    [PATH] => /Users/johnerck/svn/rocphp/path:/usr/bin:/bin:/usr/sbin:/sbin
    [SERVER_SIGNATURE] => 
    [SERVER_SOFTWARE] => Apache/2.2.21 (Unix) mod_ssl/2.2.21 OpenSSL/0.9.8r DAV/2 PHP/5.3.6
    [SERVER_NAME] => localhost
    [SERVER_ADDR] => ::1
    [SERVER_PORT] => 8888
    [REMOTE_ADDR] => ::1
    [DOCUMENT_ROOT] => /Users/johnerck/git/rocware.com/www
    [SERVER_ADMIN] => you@example.com
    [SCRIPT_FILENAME] => /Users/johnerck/git/rocware.com/www/index.php
    [REMOTE_PORT] => 53964
    [GATEWAY_INTERFACE] => CGI/1.1
    [SERVER_PROTOCOL] => HTTP/1.1
    [REQUEST_METHOD] => GET
    [QUERY_STRING] => m=dashboard
    [REQUEST_URI] => /?m=dashboard
    [SCRIPT_NAME] => /index.php
    [PHP_SELF] => /index.php
    [REQUEST_TIME] => 1335661670
    [argv] => Array
        (
            [0] => m=dashboard
        )

    [argc] => 1
)
*/

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