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Request #77559 Support callable::class and array::class
Submitted: 2019-02-03 03:53 UTC Modified: 2019-02-03 04:39 UTC
From: mister dot pedantic at example dot org Assigned:
Status: Not a bug Package: *General Issues
PHP Version: Irrelevant OS: Irrelevant
Private report: No CVE-ID: None
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 [2019-02-03 03:53 UTC] mister dot pedantic at example dot org 
Description:
------------
AFAIK, all ::class work except these two.

Thanks.

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 [2019-02-03 03:58 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2019-02-03 03:58 UTC] requinix@php.net 
Neither of those are classes.
 [2019-02-03 04:04 UTC] requinix@php.net 
Actually this should get a longer answer.

array and callable are keywords. They cannot be used for classes.
http://php.net/manual/en/reserved.keywords.php

int and string and such are not keywords, so int::class and string::class are supported. However at this time you cannot create classes named "int" or "string" because PHP is reserving those for its own possible future implementation.
 [2019-02-03 04:22 UTC] mister dot pedantic at example dot org 
Also static is a keyword, but static::class works. they are all de-facto classes/types.
 [2019-02-03 04:39 UTC] requinix@php.net 
https://3v4l.org/FohH3

static is a special case. It needs to be a keyword because it can be used for syntax (static class methods and properties and static variables) but it can also be used like self and parent (which aren't keywords). In fact you can see the deliberate support for "static" as a pseudo-class name having to be written right into the parser:
https://github.com/php/php-src/blob/PHP-7.3.1/Zend/zend_language_parser.y#L1038
 
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