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Bug #49046 namespaces with leading \ misbehave
Submitted: 2009-07-24 11:26 UTC Modified: 2009-07-24 16:58 UTC
From: simon at stienen dot name Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5.3SVN-2009-07-24 (SVN) OS: FreeBSD
Private report: No CVE-ID: None
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 [2009-07-24 11:26 UTC] simon at stienen dot name 
Description:
------------
So much wrong here ...

The initial intention was to get back into global namespace using the "namespace X;" syntax. (Why isn't this possible? Neither as namespace; namespace \; ... not even namespace \\;)

Curiously, "namespace \" expected the name of a constant.
Even more curiously, "namespace \foo" is looking for the constant "foo" in the *current* namespace.
If the constant exists, the namespace directive is simply ignored.
If it does not, the script dies with a fatal error.

Reproduce code:
---------------
namespace Foo;
const Bar = "Blob";

namespace \Bar;
function x() { echo __NAMESPACE__; }
x();


Expected result:
----------------
Pretty much everything else than the actual result ... but at least "Bar" or "Blob"

Actual result:
--------------
Foo

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 [2009-07-24 13:18 UTC] simon at stienen dot name 
Whyever this is necessary:

<?php
namespace Foo;
const Bar = "Blob";

namespace \Bar;
function x() { echo __NAMESPACE__; }
x();
?>

... happy now?)
 [2009-07-24 16:46 UTC] cellog@php.net 
the code below is looking for the Bar constant in the current namespace,

see http://us3.php.net/manual/en/language.namespaces.nsconstants.php
 [2009-07-24 16:47 UTC] cellog@php.net 
note that there is some dissent amongst developers about the usefulness of the "namespace" operator, so this may go bye-bye in a future PHP 5.3.x, in which case this bug will re-open
 [2009-07-24 16:58 UTC] cellog@php.net 
more to the point, here are 2 scripts that do what you want it to do:

<?php
namespace Foo;
const Bar = "Blob";

namespace Bar;
function x() { echo __NAMESPACE__; }
x(); // echoes "Bar"
?>

<?php
namespace Foo {
const Bar = "Blob";
}
namespace Bar {
function x() { echo __NAMESPACE__; }
x(); // echoes "Bar"
}
?>

and to go to global namespace, there is only one way:

<?php
namespace Foo {
const Bar = "Blob";
}
namespace {
function x() { echo __NAMESPACE__; }
x(); // echoes nothing
}
?>
 
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