On Dec 19, 2007 11:17 AM, Andrew Ballard <aballard@xxxxxxxxx> wrote:
> On Dec 18, 2007 4:58 PM, Jim Webber <webber@xxxxxxxxxxxxxxx> wrote:
> > Hello I have a PHP4 server and I'm trying to figure out how to do
> > "implements" on classes. Is there an analogous way to do this without
> > PHP5 installed?
> >
>
> It isn't inheritance in the same sense as PHP5, but you can use the
> method_exists() function to check whether a given object has the
> method you want to use before you try to use it.
>
> if (method_exists($obj, 'doSomething')) {
> $obj->doSomething();
> } else {
> // $obj does not support the required interface
> }
>
> This at least allows a way for your code to enforce the interface on
> an as-needed basis and recover gracefully.
this is indeed the best, if not only, way to emulate interfaces in php4;
i believe this was recommended some time back as well.
-nathan
