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Date: Fri, 7 Sep 2012 03:32:25 +0300
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To: Levi Morrison <morrison.levi@gmail.com>
Cc: Sherif Ramadan <theanomaly.is@gmail.com>, Mark <markg85@gmail.com>, internals@lists.php.net
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Subject: Re: [PHP-DEV] Why are the PHP namespaces different compared to C++?
From: g.b.yahav@gmail.com (Yahav Gindi Bar)

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On Fri, Sep 7, 2012 at 3:21 AM, Levi Morrison <morrison.levi@gmail.com>wrote:

> On Thu, Sep 6, 2012 at 6:15 PM, Sherif Ramadan <theanomaly.is@gmail.com>
> wrote:
> > On Thu, Sep 6, 2012 at 5:30 PM, Mark <markg85@gmail.com> wrote:
> >> Hi,
> >>
> >> I was just using the PHP namespaces for the first time and noticed a
> >> difference that i really didn't expect. (No, i won't start complaining
> >> about the slash based namespace).
> >>
> >> In C++ when you type:
> >> using std;
> >>
> >> Then you can use all methods/classes/whatever is defined in std
> >> without typing std.
> >> so: std::cout becomes just cout.
> >>
> >> In PHP that's a bit different. Lets take this as an example:
> >> =================================
> >> namespacetst.php
> >>
> >> <?php
> >> namespace Some\Long\Namespace;
> >>
> >> Class SomeClass
> >> {
> >> }
> >>
> >>
> >> Now the one using that "SomeClass" has to do something like this:
> >> index.php
> >> use Some\Long\Namespace;
> >>
> >> $oClass = new Namespace\SomeClass();
> >> =================================
> >>
> >> Yes, you can also do:
> >>
> >> index.php
> >> use Some\Long\Namespace\SomeClass;
> >> $oClass = new SomeClass();
> >>
> >> But i'm wondering why the "use Some\Long\Namespace" doesn't work like
> >> the C++ one. Since i would have guessed that adding that use will give
> >> me access to all the methods/classes/whatever that live within that
> >> namespace _without_ having to prefix it with the last part of the
> >> namespace.
> >>
> >> I hope someone can shed some light over this.
> >>
> >> Regards,
> >> Mark
> >>
> >> --
> >> PHP Internals - PHP Runtime Development Mailing List
> >> To unsubscribe, visit: http://www.php.net/unsub.php
> >>
> >
> >
> > Yes, PHP namespaces are completely different from what you'd be used
> > to in C++. In all honesty namespaces were never well designed in PHP
> > and were implemented in a haphazard way, which is why I generally
> > don't bother using them.
> >
> > To clarify, importing namespaces in PHP isn't like importing
> > namespaces in C++ at all, really. You are merely aliasing namespaces
> > in PHP when you use the "use" keyword. Meaning that what's actually
> > happening is PHP expects you to alias one namespace to another (and
> > thus you can never import one namespace directly into the existing
> > namespace since this creates a name conflict). It's messy...
> >
> > NameSpacedFile.php
> > namespace My\Name\Space;
> > class MyClass { }
> >
> >
> > Index.php
> > use My\Name\Space; // This doesn't actually import anything
> > // What happened here is we created an alias
> > // It's the same thing as saying "use My\Name\Space as \Space
> > // So now My\Name\Space is aliased to \Space
> >
> > $obj = new \Space\MyClass; // great
> > $obj = new MyClass; // this won't do what you want
> >
> >
> > Here's the full example:
> >
> > http://viperpad.com/qcAUNM
> >
> > It simply doesn't work like that because PHP's namespaces are
> > implemented in such a way that they don't really resemble namespaces.
> > Just some fancy magic going on in the engine that allow it to mimic
> > namespaces.
>
> While that is true, I cannot stress their importance in organizing
> code.  Nearly every codebase I've seen that can use namespaces maps
> the namespace to the file system which makes for very easy-to-code
> autoloaders.  Very helpful indeed.  It would be nice to see improved
> namespaces, though.
>
> --
> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>
Will the current implementation of namespace designed for import all
classes, functions and such from namespace? or it should be rewritten
entirely in order to support that?

How about adding ability to import the entire namespace?

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