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Date: Sun, 1 Sep 2013 16:30:18 -0400
Message-ID: <CAAyV7nH53sBKepCU0xwRuO=XwiaCqO_ZH+dkajDvb4ar2-WhPA@mail.gmail.com>
To: Nicolas Grekas <nicolas.grekas+php@gmail.com>
Cc: "internals@lists.php.net" <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=bcaec548a929f0d21504e55852df
Subject: Re: [PHP-DEV] Re: Function autoloading
From: ircmaxell@gmail.com (Anthony Ferrara)

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Content-Type: text/plain; charset=ISO-8859-1

Nicolas,

On Sun, Sep 1, 2013 at 11:27 AM, Nicolas Grekas <
nicolas.grekas+php@gmail.com> wrote:

> My previous message didn't push the point I wanted raise: don't we have a
> major problem related to at-run-time namespace resolution for functions and
> constants?
>
> Take this code: namespace foo { strlen("bar"); }
>
> Will you trigger an autoload for foo\strlen?
> I believe not because that would hurt performance too much.
> But then, how will you load function foo\strlen if it exists?
>
> Now take this code: namespace foo { bar(); }
>
> Will you trigger autoload for "foo\bar" first, then for "bar"?
> Only for "foo\bar"? But then, what if "bar" exists and just waits being
> autoloaded?
>
> I fail to see how autoloading functions is compatible with at-run-time
> namespace resolution.
>

So, here's how it works, by example:

namespace foo {
    use function biz\buz;
    use foo\bar;

    something(); // autoloaded as "something"
    buz(); // autoloaded as "biz\buz"
    bar\baz(); // autoloaded as "foo\bar\baz"
    \load\execute(); // autoloaded as "load\execute"
}

So basically, if the call uses "fallback" resolution, the autoload is only
attempted at the global resolution.

Does that make sense?

Anthony

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