[RFC] Proposal namespace importing with from syntax

Hi Andrew,

在 2012年7月24日星期二，下午11:39，Andrew Faulds 写道：

Hi, internals,
I'm proposing a improvement to namespace importing. when using 'use' statement to import
many classes, we have to duplicate many times even we are importing from the same namespace.

I propose a new syntax to import classes\functions\constant in a single statement.

here is the example:

<?php
// reduce
use GlobalNamespace\SubSpace\ThirdSpace\Class1;
use GlobalNamespace\SubSpace\ThirdSpace\Class2;
use GlobalNamespace\SubSpace\ThirdSpace\ForthSpace\Class3;
// to
from GlobalNamespace\SubSpace\ThirdSace use Class1, Class2 as Alias2, ForthSpace\Class3 as Alias3;
?>

The above code should be self-explained.

More info could be found at the RFC page and the patch.

RFC: https://wiki.php.net/rfc/namespace-importing-with-from
PATCH : https://github.com/reeze/php-src/compare/rfc-from-use

Any Opinion, suggestion, improvement will be much appreciated.

Thanks
Ah, so something a la python's from x import y, z? Sounds good. Somewhat
surprised we don't already have this.

One comment: "use Class1, Class2 as Alias2, ... ;" confuses me a bit. I
read it as "use (Class1, Class2) as Alias2, ... ;". //Perhaps this is

It means use Class1 and use Class2 but aliased with name Alias2 etc.
It almost the same as bare 'use' statement, but with a common prefix :)

Thanks

just a formatting issue (with newlines it would be more clear), but it
looks a little weird to me.

Just my 2¢.

--
Andrew Faulds
http://ajf.me/

Hi Stas,

在 2012年7月25日星期三，上午2:33，Stas Malyshev 写道：

Hi!

from GlobalNamespace\SubSpace\ThirdSace use Class1, Class2 as Alias2, ForthSpace\Class3 as Alias3;

I'm not sure it's necessary. If you import a real lot of the classes
from the same namespace, just import the parent namespace. And this

No, we can not import namespace directly for now :
<?php
namespace A {
class B {}
}

namespace {
use A;

var_dump(new B());
}

Warning: The use statement with non-compound name 'A' has no effect in /Users/reeze/Opensource/php-test/php-src-master/a.php on line 7

if we wan to archive the goal of import anything. the only way is to declare the current namespace
as "the parent namespace" we want to import from, eg:

<?php
namespace Zend {
class B {}
}

namespace Zend {

var_dump(new B());
}

but this is not preferred for use code declared as the library we used.

syntax makes less clear what is the true name of Class2 and also by
similarity to python syntax would lead people to think it does the same
thing python one does - which it is not.

Sorry, I didn't make myself clear. the example I posted is not correct. It didn't have to alias the imported classes.
'use' statement can alias the imported class too, the proposed 'from xx use yy' is almost
the same as 'use'

The correct example should be:

<?php
// if we don't want to duplicated then the follow could be
use GlobalNamespace\SubSpace\ThirdSpace\Class1;
use GlobalNamespace\SubSpace\ThirdSpace\Class2;
use GlobalNamespace\SubSpace\ThirdSpace\Class3;
// reduced to
from GlobalNamespace\SubSpace\ThirdSace use Class1, Class2, Class3 ;
?>

and if we need alias we could：
<?php
// reduce
use GlobalNamespace\SubSpace\ThirdSpace\Class1;
use GlobalNamespace\SubSpace\ThirdSpace\Class2 as Alias2;
use GlobalNamespace\SubSpace\ThirdSpace\ForthSpace\Class3 as Alias3;
// to
from GlobalNamespace\SubSpace\ThirdSace use Class1, Class2 as Alias2, ForthSpace\Class3 as Alias3;
?>

Thanks stas.

--
Stanislav Malyshev, Software Architect
SugarCRM: http://www.sugarcrm.com/
(408)454-6900 ext. 227