Ok I get that, thankyou for the explanation.
static::class is not an option. I'm trying to resolve class names defined in
docblocks, since phpdoc2 allows for entering type hints (classes) as
namespace/use relative. And I can tell there is no current way of resolving
class names in strings, to FQCN's, unless I'm missing something? (There is no
way to get a list of the currently used namespaces as far as I can tell - would
such a function be possible to add to the SPL, without any major rewriting?)
So, I'm simply wondering if this would require any major rewriting to support?
Otherwise I could look into it and try to write a patch... Because I think this
would be really useful for framework developers, php unit testing and php doc
for example.
-Jens
On Feb 25, 2013, at 11:20 AM, Nikita Nefedov <inefe...@gmail.com> wrote:
> On Mon, 25 Feb 2013 14:00:04 +0400, Jens Riisom Schultz <ibmu...@me.com>
> wrote:
>
>> Hi everybody,
>>
>> I have read up on this, and done some testing.
>>
>> First up, my findings with PHP5.5 alpha5:
>>
>> <?php
>> namespace spacy;
>>
>> class classy {
>> public static function fqcn() {
>> /* This works but is not useful enough: */
>> //return self::class;
>>
>> $me = 'classy';
>>
>> /* This just doesn't work, but I wish it did: */
>> //return $me::class;
>>
>> /* This simply does not work as expected: */
>> return eval("return $me::class;");
>> /* Output: "classy" - Expected output: "spacy\classy" */
>> }
>> }
>> ?>
>>
>> I'm trying to late resolve a class name contained in a variable to the FQCN.
>> I understand that this is hard (maybe even impossible) with the current
>> implementation, because class name resolution happens compile time, but
>> eval("return $me::class;") simply returns something that is weird.
>>
>> I guess what I'm trying to ask is whether it would be impossible to support
>> late FQCN resolution in any way? It would be very useful for frameworks to
>> be able to do this.
>>
>> - Jens Riisom Schultz
>> --
>> PHP Internals - PHP Runtime Development Mailing List
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>>
>
> Hi Jens,
>
> Here's what happened in your code:
> When you invoked fqcn(), you created var $me = "classy";
> Then you tried to invoke this code in eval: "return classy::class;"
> But when php evals code, it's like including another file. So it executes the
> code without any namespace (it's in global namespace), and php didn't
> discover class with name classy (there's only spacy\classy) yet, so it tries
> to resolve all your "use" statements (but you didn't write any) and then just
> gives you "classy", it didn't throw any error just because it tried to delay
> autoloading of this class as far as possible, if would do eval("return new
> $me;") then you would get fatal error.
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