class foo
{
const bar;
}
and to access it we have to do: self::bar; and not, $this->bar;
Is this correct? If so, why?
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Yes this is correct. The reason is that a constant is class-bound whereas a property is instance-bound so it wouldn’t make much sense to access it through a reference. No matter how many instances you create there will always only be one foo::bar const.
It’s just a language design decision that it’s not possible to access a const through a reference though, in Java for example you can indeed access a static final property through a reference but you will usually get a compiler warning.