Question

Let’s have this class

class A {
  protected static function ident() { return "I am A"; }
  public static function say() { return "I say '".self::ident()."'!"; }
}

Then I need to extend class A and override the ident() like this

class B extends A {
  protected static function ident() { return "I am B"; }
}

Now when B::say(); is called, the result is I say ‘I am A’. Is there any technique how to force it to produce I say ‘I am B’ without overriding the say() method? (Please don’t ask me why to do this, just trust me it is reasonable in my project)

I believe it is possible via abstract class or interface, but I can not figure out how. If it is impossible in PHP, is there any language (except Haskell) which implements this feature?

Answer 1

Since PHP 5.3 late static bindings are available. You shouled take a look at that.

http://php.net/manual/en/language.oop5.late-static-bindings.php