Return signatures of Autoloader's loaders should be void

[paulbalandan]

Description
Ref: https://www.php.net/manual/en/function.spl-autoload-register.php

As a result of this change, this may be a potential BC break. I added this to the changelog. Also marked @internal those 2 callbacks.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[kenjis]

@paulbalandan I don't see the benefit. I don't think this is a bug.
Returning a value does not cause errors. I don't see that the callback return type must be void in PHP manual.
If you really want to change it, it is better to send to 4.4.

I think adding @internal is okay.

[paulbalandan]

The signature is in the Parameters section:

callback
The autoload function being registered. If null, then the default implementation of spl_autoload() will be registered.

callback(string $class): void
The class will not contain the leading backslash of a fully-qualified identifier.

Okay, I'll send to 4.4

[kenjis]

@paulbalandan Okay, the callback return type should be void.