Invalid return type "void" for get_post_custom_keys

[kesselb]

Source

<?php

function test() {
    return;
}

var_dump(test());

Output

NULL

Trac ticket: https://core.trac.wordpress.org/ticket/58612

[johnbillion]

Thanks for the report @kesselb. In PHP, ​void is a special return type which indicates that the function returns nothing. It's not a real type, therefore it gets coerced to null as in your example, but void is the correct type here.

Cheers!

Closing as per the ticket.

Would you accept the change if I change return; to return null; as you suggest in ​https://github.com/szepeviktor/phpstan-wordpress/issues/176#issuecomment-1507376826?