Rule source on GitHub

DowngradeDynamicClassConstFetchRector

Change dynamic class const fetch Example::{$constName} to constant(Example::class . '::' . $constName)

-$value = Example::{$constName};
+$value = constant(Example::class . '::' . $constName);

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\DowngradePhp83\Rector\ClassConstFetch\DowngradeDynamicClassConstFetchRector;

return RectorConfig::configure()
    ->withRules([
        DowngradeDynamicClassConstFetchRector::class,
    ]);