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I found out that object constants in PHP always have public visibility so it is not possible to set them to protected or private like this:
<?php
class MyClass {
protected const constant = "this won't work";
}
?>
What’s the explanation for this? I can’t think of a good reason to force constants to be public.
That’s a rather philosophical question, which is discussed in the comments for Class constants in the PHP Manual. The argument seems to be that Visibility identifies who has the right to change members, not who has the right to read them. Since constants cannot be changed, there is no point in having them support visibility when visibility is understood as access modifiers. If you follow that argumentation or go with the linked feature request below your question is up to you.