note 80943 added to language.oop5.interfaces

I'm slightly confused by interfaces and abstract classes. They both seem to do the same thing, ie declare function specification. Maybe I'm missing an illusive point here of both features existing in php. ---- Server IP: 194.145.210.3 Probable Submitter: 78.149.170.185 ---- Manual Page -- http://www.php.net/manual/en/language.oop5.interfaces.php Edit -- https://master.php.net/note/edit/80943 Del: integrated -- https://master.php.net/note/delete/80943/integrated Del: useless -- https://master.php.net/note/delete/80943/useless Del: bad code -- https://master.php.net/note/delete/80943/bad+code Del: spam -- https://master.php.net/note/delete/80943/spam Del: non-english -- https://master.php.net/note/delete/80943/non-english Del: in docs -- https://master.php.net/note/delete/80943/in+docs Del: other reasons-- https://master.php.net/note/delete/80943 Reject -- https://master.php.net/note/reject/80943 Search -- https://master.php.net/manage/user-notes.php