Re: Detecting Multi-Scope Variables

"Brad Lorge" <brad@lorge.com.au> wrote: >Perhaps my question was not as succinct as it could have been. > >Basically, can you think of a means through which to detect whether or >not a >variable is currently present in multiple scopes. > >IE: > ><?php > >$bob = "fish"; > >echo is_multiscoped($bob); //False > >function something() >{ > echo is_multiscoped($fish); //False > gloabal $bob; > echo is_multiscoped($bob);//True >} > >function getJam($&ref) >{ > echo is_multiscoped($ref);//True >} > >$jim = "nothing special"; > >echo is_multiscoped($jim); //False > >getJam($jim); > > >?> > >On Tue, Feb 1, 2011 at 7:12 PM, Tommy Pham <tommyhp2@gmail.com> wrote: > >> > -----Original Message----- >> > From: Brad Lorge [mailto:brad@lorge.com.au] >> > Sent: Monday, January 31, 2011 9:53 PM >> > To: php-general@lists.php.net >> > Subject: [PHP] Detecting Multi-Scope Variables >> > >> > Hello All, >> > >> > I am new to the list so please be gentle :) >> > >> > I am working on a PHP framework and have run up against a >functionality >> > hurdle which I keep falling at. Basically, I have three mechanisms >which >> all >> > function in a similar way and require this functionality: >templating, >> event >> > handling and "action handling". Within the core code of the >application, >> as >> > is common with many applications with plugin architecture, I pass a >> number >> > of parameters to functions which have hooked into a particular >"event". >> Part >> > of the mechanism is that parameters can be passed by reference to >allow >> > for the listeners to make modifications. >> > >> > $username="bob";$account_type="ISV";$password="fishbum"; >> > >> > register_action_listener('process_user', function($username, >> > $account_type, $password){$username.="." . $account_type;} // Or >> > whatever >> > >> > call_action('process_user', &$username, &$account_type, >&$password); >> > //Result: $username == "bob.ISV" >> >> I think you meant to use [1]. >> >> > >> > Now, what I am trying to do is establish a method to prevent the >"hook" >> > functions from making changes by reference without reference >explicitly >> > being passed to them by the calling code. >> > >> >> Perhaps you should review [2] and see if your logic works with your >> 'call_action'. >> >> > I have thought of a method which simply makes a copy of all the >> parameters >> > for each listener within call_action(), however what I would really >love >> is a >> > function which returns whether or not the supplied variable is >available >> in >> > multiple scopes or is in the original scope which it was >initialized in. >> > Does anyone know of a way to achieve this? >> > >> > Regards, >> > Brad >> >> Happy coding, >> Tommy >> >> [1] http://php.net/call_user_func >> [2] http://php.net/references >> >> >> In more low level languages like C and C++ you could look at the actual value of the pointer, I'm not sure that that is available in php. Thanks Ash http://www.ashleysheridan..co.uk -- Sent from my Android phone with K-9 Mail. Please excuse my brevity.