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To: Niklas Keller <me@kelunik.com>, PHP Internals <internals@lists.php.net>
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Date: Tue, 7 Feb 2017 18:30:24 +0100
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Subject: Re: [PHP-DEV] Namespaces in Core
From: php@fleshgrinder.com (Fleshgrinder)

On 2/7/2017 11:39 AM, Niklas Keller wrote:
> I don't see this as a potential problem. Autoloadeds are (1) not triggered
> for already loaded symbols and (2) and more importantly, autoloaders
> usually use a list of prefixes to load, so a whitelist, not a blacklist.
> 
> Regards, Niklas
> 

This is related to previous discussions about the implementation of
auto-loaders for functions and constants where we it was always a
problem on how to deal with stuff that has no use statement and no
namespace prefix, e.g.:

    <?php

    namespace Fleshgrinder\Examples;

    in_array('foo', ['foo']);

Is this now the `in_array()` from PHP? Is this function defined in
`Fleshgrinder\Examples`?

One way to resolve this is:

    <?php

    namespace Fleshgrinder\Examples;

    \in_array('foo', ['foo']);

This is unambiguous and clear, we have that one loaded already and
everything is fine. However, it introduces a backslash oriented
programming and makes everything harder to read.

    <?php

    namespace Fleshgrinder\Examples;

    use function PHP\in_array;

    in_array('foo', ['foo']);

This solves the issue too. Of course this becomes annoying very fast but
that is why I said that nikic's scalar objects should be introduced as well.

    <?php

    namespace Fleshgrinder\Examples;

    ['foo']->contains('foo');

In all cases, we know that the auto-loader does not require triggering
because the references are not ambiguous and that is what this was about.

-- 
Richard "Fleshgrinder" Fussenegger