Why does PHP 5.2 disallow abstract static class methods?

Posted by Artem Russakovskii on Stack Overflow See other posts from Stack Overflow or by Artem Russakovskii
Published on 2009-06-16T00:07:03Z Indexed on 2010/06/16 11:32 UTC
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php

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oop

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php5

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static

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abstract

After enabling strict warnings in PHP 5.2, I saw a load of strict standards warnings from a project that was originally written without strict warnings:

Strict Standards: Static function Program::getSelectSQL() should not be abstract in Program.class.inc

The function in question belongs to an abstract parent class Program and is declared abstract static because it should be implemented in its child classes, such as TVProgram.

I did find references to this change here:

Dropped abstract static class functions. Due to an oversight, PHP 5.0.x and 5.1.x allowed abstract static functions in classes. As of PHP 5.2.x, only interfaces can have them.

My question is: can someone explain in a clear way why there shouldn't be an abstract static function in PHP?

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