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php-developer-list | 2002112

Re: [PHP-DEV] on the subject of overloading: __call() From: Brad Bulger (tater <email protected>)
Date: 11/17/02

On Sun, 17 Nov 2002, Stanislav Malyshev wrote:

> BB>> related topic: in the current state of ze2, there are several ways to
> BB>> call methods directly that can't be emulated by call_user_func() -
> BB>> calling self::method() for instance, or the visibility of $this if
> BB>> you call class::method(). is that likely to stay true?
>
> Since __call is the method of the class, calling self::method can be
> achieved, I think. As for the second point - could you please explain
> furher what you mean, maybe with an example?

right, because static method calls don't get caught by __call, so you
always have $this.

the basic problem is that as it is now, if i do any of these

        self::a_method($arg1,$arg2);
        parent::a_method($arg1,$arg2);
        some_other_class::a_method($arg1,$arg2);

inside of a class's method, $this is visible inside those called methods,
and points to the calling object.

but there is no way to make equivalent calls using call_user_func()
or call_user_func_array(). you can't use "parent::a_method",
array($this,'parent::a_method'), array(parent,"a_method"),
or array('parent',"a_method"). if you use the literal class name,
        call_user_func_array(array(get_parent_class($this),'a_method'), $args);
it doesn't fail, but it's as if you were making a static method call
from outside of an object context - $this is not defined.

it's the last two cases - parent:: and some_other_class:: - that relate
to __call(), as you point out. and what truly matters is call_user_func_array(),
because not having it means you can't hand off the arguments from __call()'s
parameters to a method in the parent class or in some other class. not without
writing some pretty hacky eval() code, that is.

(btw, there should probably be a warning in the docs that methods that
are expecting to force their parameters to be references will not work
as expected when called by call_user_func_array().)

i'm attaching kind of long test case code & resulting output that
show what i mean. 

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