PHP 5.3 Late static binding problem

Question

<?php

class Base{
  protected static $somevar = false;
  public static function changeSomeVar(){
    static::$somevar = true;
  }

  public static function checkVar(){
    var_dump(static::$somevar);
  }
}

class Child1 extends Base{
  public static function setup(){
    static::changeSomeVar();
  }
}

class Child2 extends Base{

}

Child1::setup();
Child1::checkVar(); // true
Child2::checkVar(); // still true

?>

Is there a way to have Child1's $somevar different from Child2's $somevar?

(I know you could manually write protected static $somevar = false; in each subclass, but that's somewhat counter intuitive..)

"Is there a way to have Child1's $somevar different from Child2's $somevar?" --- that is what objects were developed for. — zerkms
– zerkms, Commented Sep 5, 2011 at 2:21

cwallenpoole · Accepted Answer · 2011-09-05 02:22:43Z

2

If you want a child class to have a separate class level (static) variable, you will need to re-declare the variable. So you will need protected static $somevar = false; in the child classes.

When I think about class structures in other languages, it is very intuitive to require that.

answered Sep 5, 2011 at 2:22

cwallenpoole

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5 Comments

Pwnna Over a year ago

I have a large number of static variables in this class, which keep tracks of a lot of things, and they are different for each subclass... This will make creating a subclass a really big hassle.. Is there no other way to hide that?

zerkms Over a year ago

@ultimatebuster: why don't you create objects? Objects have separated states

Pwnna Over a year ago

Here's how this goes: I have a base class that provides a lot of functionalities. Subclasses extends from the base class and provides a little bit of object variables, but each subclass needs to track the object it spawns, hence the big issue.

Pwnna Over a year ago

I think I see some kind of a factory.. >.>.. but that's complicating my thing even futher..

zerkms Over a year ago

@ultimatebuster: classical factory implementation is all about objects, not pure classes.

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