note 106113 added to function.defined

I have seen this code below with no "if statements" whatsoever : defined('APPLICATION_PATH') || define('APPLICATION_PATH', realpath(dirname(__FILE__) . '/../application')); i am wondering what it does. can any body help please? ---- Server IP: 69.147.83.197 Probable Submitter: 131.91.137.246 ---- Manual Page -- http://www.php.net/manual/en/function.defined.php Edit -- https://master.php.net/note/edit/106113 Del: integrated -- https://master.php.net/note/delete/106113/integrated Del: useless -- https://master.php.net/note/delete/106113/useless Del: bad code -- https://master.php.net/note/delete/106113/bad+code Del: spam -- https://master.php.net/note/delete/106113/spam Del: non-english -- https://master.php.net/note/delete/106113/non-english Del: in docs -- https://master.php.net/note/delete/106113/in+docs Del: other reasons-- https://master.php.net/note/delete/106113 Reject -- https://master.php.net/note/reject/106113 Search -- https://master.php.net/manage/user-notes.php