Re: [PHP-DEV] $var::$static (and $className::$staticVar)

[Bart de Boer]

I understand... My suggestion would be to map $this to the class name 
(of the current instance) if the Scope Resolution Operator '::' is used...


Marco Kaiser wrote:
Hi,

this doesnt work because static vars are bound to his class and are not
inherited by a child class.
maybe this would be work with php6 or a other 5.x version.
(Same behavior like the singleton pattern getInstance() abstract class
stuff)

-- Marco
  
Hi all,

I'd like to be able to do the following:


<?php

class Base {

    public static $var = 'hello';

    public function someFunc() {
        echo self::$var; // Currently maps to Base::$var
        echo $this::$var; // Should map to Child::$var
    }

}

class Child extends Base {

    public static $var = 'hello';

}

$class = 'Child';

$obj = new $class(); // This works.

echo $class::$var; // This doesn't. Should map to Child::$var


?>


...in other words: I'd like to be able to access static class
variables from inside an instance of the Base and/or Child classes.
I'd also like to be able to access them dynamically.
($className::$variable)

The only way to do this at the moment (to my knowledge at least) is to
create functions in the Child class that returns its static variables.
The downside of this is that those functions most likely will be very
common (in my case they are) and should therefore belong in the base
class. Hence: $this::$variable

At the moment there is no way to access static variables from outside
of the class dynamically. As a workaround for this I'm currently
creating a temporary instance (new $type()) to access them dynamically
with a __get() function in all the derived child classes.

There are ways to do it with class constants and the constant
functions. But it's not very elegant and class constants can't hold
arrays and/or objects.

I have no idea what the implications would be. Just thought it would
be a nice addition to the language. :) Hope I didn't overlook some
existing PHP feature that already allows me to do this. :|


Cheers,

Bart de Boer

    

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