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Bug #75912 No name resolution on D::class (even with warnings enabled)
Submitted: 2018-02-03 21:38 UTC Modified: 2018-02-04 17:59 UTC
From: ejrx7753 at gmail dot com Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 7.1.14 OS: Mac OS, Ubuntu
Private report: No CVE-ID: None
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 [2018-02-03 21:38 UTC] ejrx7753 at gmail dot com 
Description:
------------
I'm able to enter any random string of characters and add "::class" and it will work fine without error. PHP Documentation clearly states that this ::class feature "allows for fully qualified class name resolution". It should be a fatal error just as with new C().


Quote: "The special ::class constant are available as of PHP 5.5.0, and allows for fully qualified class name resolution at compile, this is useful for namespaced classes:" (http://php.net/manual/en/language.oop5.constants.php)

Test script:
---------------
<?php

error_reporting(E_ALL);
ini_set('display_errors', '1');

var_dump(C::class);
var_dump(\D::class);

Expected result:
----------------
Expected a fatal error

Actual result:
--------------
string(1) "C"
string(1) "D"

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 [2018-02-03 21:46 UTC] levim@php.net
-Status: Open +Status: Not a bug
 [2018-02-03 21:46 UTC] levim@php.net 
It expands to what the fully qualified class name *would be*. It will not trigger an autoload. Consider instead this snippet:

<?php
namespace Foo {
    var_dump(C::class);
    var_dump(\D::class);
}
?>

Which prints:

string(5) "Foo\C"
string(1) "D"
 [2018-02-03 21:54 UTC] ejrx7753 at gmail dot com 
I see... sounds like a documentation issue then, as ""allows for fully qualified class name resolution" seems to imply other things.
 [2018-02-03 22:16 UTC] kelunik@php.net 
It resolves the name according to name resolution rules, so I think that wording is fine.
 [2018-02-04 17:59 UTC] cmb@php.net 
FTR: this isssue is clearly documented[1]:

| The class name resolution using ::class is a compile time
| transformation. That means at the time the class name string is
| created no autoloading has happened yet. As a consequence, class
| names are expanded even if the class does not exist. No error is
| issued in that case.

[1] <http://www.php.net/manual/en/language.oop5.basic.php#language.oop5.basic.class.class>
 
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