Re: [Concept] Flip relative function lookup order (global, then local)
| From: | Rowan Tommins [IMSoP] | Date: | Fri, 23 Aug 2024 11:28:13 +0000 |
| Subject: | Re: [Concept] Flip relative function lookup order (global, then local) | ||
| References: | 1 2 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-125122@lists.php.net to get a copy of this message | ||
On Fri, 23 Aug 2024, at 10:58, Stephen Reay wrote:
> In a world where global functions take precedence over local ones
> because some people don't like writing a single \ character,
> autoloading would be a moot point because if you preference global
> functions you're implicitly telling developers they shouldn't write
> namespaced functions, by making them harder and less intuitive to use.
Sorry to reply to the same message twice, but as a concrete example, consider this code:
// Definition
namespace Acme\Foo;
class Utils {
public static function magic(string $x): int {
return \strlen($x);
}
public static function more_magic(string $x): int {
return self::magic($x) * 2;
}
}
// Caller
namespace Acme\MyApp\SearchPage;
use Acme\Foo\Utils;
echo Utils::more_magic($_GET['query']);
Rewritten as namespaced functions, with current PHP:
// Definition
namespace Acme\Foo\Utils;
function magic(string $x): int {
return strlen($x);
}
function more_magic(string $x): int {
return magic($x) * 2;
}
// Caller
namespace Acme\MyApp\SearchPage;
use Acme\Foo\Utils;
echo Utils\more_magic($_GET['query']);
With "unqualified names are global", but a new "_\" shorthand for "relative
to current", the caller is completely unaffected, but the definition becomes:
namespace Acme\Foo\Utils;
function magic(string $x): int {
return strlen($x);
}
function more_magic(string $x): int {
return _\magic($x) * 2;
}
Note how the "_\" is used in all the same places as "self::" was in the
"static class" version.
With "unqualified names are local", the change is very similar, but "the other way
around":
namespace Acme\Foo\Utils;
function magic(string $x): int {
return \strlen($x);
}
function more_magic(string $x): int {
return magic($x) * 2;
}
Regards,
--
Rowan Tommins
[IMSoP]