\array should not be usable

[exakat]

Description

The following code allows the configuration of \array as a custom (anonymous) class.

<?php

$a = new class() {};

class_alias($a::class, \array::class);

function foo(\array $x) {
    print_r($x);
}

foo($a);

?>

Resulted in this output (see https://3v4l.org/Wsb8F)

class@anonymous Object
(
)

But I expected this output instead:

Cannot use 'array' as class name as it is reserved 
Type declaration 'array' must be unqualified

As a side note, callable has the same behavior as 'array' and should be aligned.

PHP Version

8.3.13 (also 8.4 and older PHP versions)

Operating System

Tested on OSX, debian and ubuntu.

[nielsdos]

This isn't hard to fix, it would require adding more entries to reserved_class_names in zend_compile.c. This list was initially introduced in 53a40386, but never included array or callable. I suppose this is because int & friends are not actual tokens, while array and callable are. IOW: it was never possible to do class array, which I guess is the reason this was overlooked. It probably should not be much of a problem just adding them to the list. cc @iluuu1994 WDYT

[iluuu1994]

Sounds good to me. I hope nobody is using this, but I'd still postpone to master.

[exakat]

Thank you!

[exakat]

As far as I can see, nobody is using that. Neither do they use \array (or similar) anywhere.
I may be the only one using it, for fun purposes anyway.