psalm/docs/running_psalm/issues/DeprecatedConstant.md

DeprecatedConstant

Emitted when referring to a deprecated constant:

<?php

class A {
    /** @deprecated */
    const FOO = 'foo';
}

echo A::FOO;

Why this is bad

The @deprecated tag is normally indicative of code that will stop working in the near future.

How to fix

Don’t use the deprecated constant.