RE: [PHP] Extending classes multiple times

This is what I had thought. I wasn't sure and needed the clarification. Thanks as always! Matt Friedman -----Original Message----- From: Harshdeep S Jawanda [mailto:hs_jawanda@yahoo.co.in] Sent: Thursday December 6, 2001 1:55 PM To: Matt Friedman Cc: php-general@lists.php.net Subject: Re: [PHP] Extending classes multiple times I am not very sure what your question is, but "multiple inheritance" means that a derived class can inherit (i.e., be derived from) more than one class. In multiple inhericance, you can have: A B | | +---+---+ | C Here, C is simultaneously derived from A & B. You can't have this in single inheritance (which is what the PHP manual is saying). This means that C can be derived from either A or B, not both. The following is always possible, irrespective of whether multiple inheritance is supported or not: A | +-B | +-C | +-D This is three different classes (B, C and D) derived from A. Hope this helps clarify your doubts. --- Matt Friedman <matt@sprynewmedia.com> wrote: > I had been under the impression that one could extend a class only > once. > That is, if I extend class A with class B I would then not be able to > extend B again with any other class. > > See: http://www.php.net/manual/en/keyword.extends.php > "An extended class is always dependent on a single base class, that > is, > multiple inheritance is not supported. Classes are extended using the > keyword 'extends'." > > With some testing however, it appears that I can extend class B with > class C and class C with class D and so on... > > Am I misinterpreting the manual? I suspect I am. Or is this a new > feature. Thoughts? > > Thanks, > > Matt Friedman > Web Applications Developer > www.SpryNewMedia.com > Email: matt@SpryNewMedia.com > > > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: > php-list-admin@lists.php.net > > > ===== Please send all emails to my automatically redirecting address: harshdeep@graffiti.net Regards, Harshdeep S Jawanda [harshdeep@graffiti.net] __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net For additional commands, e-mail: php-general-help@lists.php.net To contact the list administrators, e-mail: php-list-admin@lists.php.net