# kelly.terry.jones@xxxxxxxxx / 2007-01-03 19:14:31 -0700:
> I'm trying to implement what I think is called a "virtual method": my
> abstract parent class ParentClass defines a method xxx that calls
> method yyy, but yyy is defined only in ParentClass's children.
>
> I can't get this to work (PHP5.0.4). Sample code:
>
> === start sample code ===
>
> abstract class ParentClass {
> // xxx just returns 5 + whatever yyy() returns
> public static function xxx () {return 5 + yyy();}
> // all my children must define yyy()
> abstract static function yyy();
> }
>
> abstract class ChildClass extends ParentClass {
> public static function yyy () {return 7;}
> }
>
> echo ChildClass::xxx();
>
> === end sample code ===
>
> When I run the above, I get this error:
>
> Fatal error: Call to undefined function yyy() in <file> on line 9
>
> Changing the call from yyy() to self::yyy() gives a different error:
>
> Fatal error: Cannot call abstract method ParentClass::yyy() in <file> on
> line 9
>
> How to do this correctly?
Without "static". Chances are the code would be better served by an
instance anyway (static methods deprive you of polymorphism, as you just
found out.
--
How many Vietnam vets does it take to screw in a light bulb?
You don't know, man. You don't KNOW.
Cause you weren't THERE. http://bash.org/?255991
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