note 77777 added to tutorial.firstpage

I apologize in advance for what is probably a dumb question. My question is why? Why does one use ".php" instead of ".htm(l)"? ---- Server IP: 69.147.83.197 Probable Submitter: 76.102.130.157 ---- Manual Page -- http://www.php.net/manual/en/tutorial.firstpage.php Edit -- https://master.php.net/note/edit/77777 Del: integrated -- https://master.php.net/note/delete/77777/integrated Del: useless -- https://master.php.net/note/delete/77777/useless Del: bad code -- https://master.php.net/note/delete/77777/bad+code Del: spam -- https://master.php.net/note/delete/77777/spam Del: non-english -- https://master.php.net/note/delete/77777/non-english Del: in docs -- https://master.php.net/note/delete/77777/in+docs Del: other reasons-- https://master.php.net/note/delete/77777 Reject -- https://master.php.net/note/reject/77777 Search -- https://master.php.net/manage/user-notes.php