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Date: Thu, 5 Apr 2007 11:32:06 +0800
To: internals@lists.php.net
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Subject: abstract static function
From: diogin@gmail.com ("Jingcheng Zhang")

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Hi internals,
    I used to use abstract static function prior to php 5.2, because when I
consider static class as a singleton, I can use abstract static function to
delay the implementation of some methods to the derived classes. This
happens, for example, when I declare a parent dispatcher, and extend it into
two classes - action dispatcher and ajax dispatcher - and declare them
static as I want to keep them a singleton because they are just application
models, not domain models:

<?php
abstract class Dispatcher {
    abstract public static function dispatch();
    public static function exampleMethod() {
        ...
    }
}
final class ActionDispatcher {
    public static function dispatch() {
        parent::exampleMethod();
        // other code...
    }
}
final class AjaxDispatcher {
    public static function dispatch() {
        parent::exampleMethod();
        // other code...
    }
}
?>
    Unfortunately, since php 5.2, although it does still allow declaring
static methods in an interface, it simply generates a message when declaring
abstract static functions with error_reporting set to E_ALL | E_STRICT.
    PHP is a dynamic language, not static as C++ and Java. So, why not allow
abstract static functions? It is also a good way to support singleton
natively.
    Waiting for explanations. Thanks :)

-- 
Best regards,
Jingcheng Zhang
Room 304, Dormitory 26 of Yuquan Campus, Zhejiang University
P.R.China

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