note 69122 added to function.getenv

Hi, i'm new in PHP, can you tell me why i should use getenv('REMOTE_ADDR'); instead of $_SERVER['HTTP_REMOTE_ADDR']; (for example)? ---- Server IP: 66.163.161.117 Probable Submitter: 84.180.203.1 ---- X-Spam-Status: No, hits=3.1 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER autolearn=no version=2.64 ---- Manual Page -- http://www.php.net/manual/en/function.getenv.php Edit -- https://master.php.net/note/edit/69122 Del: integrated -- https://master.php.net/note/delete/69122/integrated Del: useless -- https://master.php.net/note/delete/69122/useless Del: bad code -- https://master.php.net/note/delete/69122/bad+code Del: spam -- https://master.php.net/note/delete/69122/spam Del: non-english -- https://master.php.net/note/delete/69122/non-english Del: in docs -- https://master.php.net/note/delete/69122/in+docs Del: other reasons-- https://master.php.net/note/delete/69122 Reject -- https://master.php.net/note/reject/69122 Search -- https://master.php.net/manage/user-notes.php