|
|
php.net | support | documentation | report a bug | advanced search | search howto | statistics | random bug | login |
[2014-12-11 22:07 UTC] llmll at gmx dot de
Description:
------------
The problem is equivalent to self:: and static:: but on the namespace realm. self:: resolves to the defining class while static:: resolves to the current instance class.
Take a second to understand the test script and expected result.
Reopening #68485 as current behaviour deviates clearly from the documentation, which the original maintainer failed to grasp.
Test script:
---------------
// original namespace
namespace Alpha;
class Helper {
public static $Value = "ALPHA";
}
class Caller {
public static function Write() {
// call to relative neighbour class Helper, resolves to \Alpha\Helper::
echo Helper::$Value;
}
}
// now both classes are inherited into another namespace
namespace Beta;
class Helper extends \Alpha\Helper {
public static $Value = 'BETA';
}
class Caller extends \Alpha\Caller {}
\Beta\Caller::Write();
Expected result:
----------------
This should print "BETA". PHP namespace resolution documentation states:
Inside namespace (say A\B), calls to unqualified or qualified class names (not fully qualified class names) are resolved at >>> RUN-TIME <<<. This only makes sense, if at runtime the current class scope and the current namespace are taken into account to resolve the class. Otherwise resolving at runtime or at compiletime makes no difference.
Actual result:
--------------
The call to Helper::$Value is resolved at complie-time which is breaking inheritance logic.
Helper:: should resolve to the instance namespace, because it is called without a namespace qualifier, meaning we want the relative class to the current namespace. Otherwise we could have written the fully-qualified \Alpha\Helper to fix the used Helper class, even in child classes.
PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
|
|||||||||||||||||||||||||||
Copyright © 2001-2024 The PHP GroupAll rights reserved. |
Last updated: Thu Dec 26 21:01:28 2024 UTC |
Hi requinix@php.net, stay calm. A bug is no reason to shout at people. Coding is not a matter of feeling but of precision. There is runtime and there is write-time and there is a big difference which you play down. Why not ponder on the problem, and then admit and correct it? Everybody will benefit from clarification. (I remember doing the same convincing for the necessity of static::, when years ago PHP lacked late static binding and only had the nowadays completely useless self:: operator. In time, people appreciated the late static binding :-)) Now comes the difficult part. In our project we really need to address the current namespace at runtime, as it offered in PHP's documentation. I see no way of explaining the why and how to you, considering your prior reasoning. Just for reference for others, here is how we compensate for it: public static function typeNameOfPeer($aClass) { return static::moduleName() . '\\' . $aClass; } moduleName() returns the current class' namespace. So if we want to call a class dynamically in the current namespace, we need to write: $class = static::typeNameOfPeer('RelativeNameOfClass'); $class::callAMethod(); I was hoping to get in touch with another maintainer. Please don't be offended or take it personally when I request the bug to be transferred to a colleague who knows PHP namespaces and inheritance mechanics. Thanks.