fix: use ::class instead of string for class name

[matzeeable]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Need Doc update	no

Describe your change

Use the ::class identifier to get the full qualified name for a class instead of a string.

What problem is this fixing?

I want to bundle this package within my WordPress plugin together with PHP-Scoper, unfortunately it does not scope a function within functions.php correctly.

PHP-Scoper is a tool which essentially moves any body of code, including all dependencies such as vendor directories, to a new and distinct namespace.

PHP-Scoper does currently not support scoping array callbacks, see also humbug/php-scoper#294

[chloelbn]

Hi @matzeeable ! could you try and rebase on master please to see if this fixes the tests in the CI? Thanks

[matzeeable]

Hey @chloelbn ! Just rebased from upstream, unfortunately the CI failed again. Can you please check what happens here? I think the code changes shouldn't be the problem. :-)

[chloelbn]

Hi @matzeeable ! Indeed we need to solve this issue for the CI for ext contributors. I'll run your PR locally and merge it without the CI is everything goes fine. Could you just fix the conflict please? Thanks!

[matzeeable]

Hey @chloelbn ! Just resolved the conflict :-)