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getInstance and new self()

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Jeffrey Moss

22 years ago

I found this on a zend engine 2 list archive, but didn't see an answer, has
it been resolved? I am trying to create a singleton class heirarchy without
having to override getInstance....

<?php
class Test {
public static function getInstance() {
return new self();
}
}

class Foo extends Test {
}

var_dump(Foo::getInstance());
?>
thekid@friebes:~/devel/php/tests > php5 self.php
object(test)#1 (0) {
}

Expected output would be "object(foo)", so I guess either "self" should
not be evaluated at compile time or this should be disallowed. I'd
prefer the first:)

http://www.zend.com/lists/engine2/200307/msg00033.html

Andi Gutmans

22 years ago

self:: is always evaluated at compile-time and refers to the class it is
defined in and not the concrete object/class.

Andi

At 05:03 PM 3/8/2004 -0700, Jeffrey Moss wrote:

Ferdinand Beyer

22 years ago

On 14 Mar 2004 at 19:31, Andi Gutmans wrote:

> self:: is always evaluated at compile-time and refers to the class it is
> defined in and not the concrete object/class.
>
> Andi

I think it would be a better for self to refer to the concrete class.
Otherwise it is not possible to access overridden static functions or
to instantiate the concrete class.

--
Ferdinand Beyer
<fb@fbeyer.com>