note 58176 added to faq.html

Hi, I have a question on file extension .html & .php. Look like PHP is some kind of a super set of html, can I just rename all my .html file to .php?? If possible, what is the disadvantage? THANKS.... Kenny ---- Manual Page -- http://www.php.net/manual/en/faq.html.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+58176 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+58176&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+58176&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+58176&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+58176&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+58176&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+58176&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+58176&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+58176&report=yes Search -- http://master.php.net/manage/user-notes.php