Bug Report

Minimal PHP Code Causing Issue

See https://getrector.com/demo/8a4b4765-e93f-463c-a784-a00d573197a6

<?php

final class DemoFile
{
    public function run()
    {
        return PHP_VERSION_ID >= 80100 ? hash( 'xxh128', $value ) : hash( 'md4', $value );
    }
    
    public function run_v()
    {
        return version_compare( PHP_VERSION, '8.1', '>=' ) ? hash( 'xxh128', $value ) : hash( 'md4', $value );
    }
}

Same also when not used with a ternary but regular if

    public function run_v()
    {
        if ( version_compare( PHP_VERSION, '8.1', '>=' ) ) {
            return hash( 'xxh128', $value );
        }
        
        return hash( 'md4', $value );
    }

Responsible rules

• DowngradeHashAlgorithmXxHashRector

Expected Behavior

If there is a version check with PHP_VERSION_ID or PHP_VERSION it should not modify the code, since this is correct.

In addition, I'd say that also PHP_MAJOR_VERSION > 8 should not be changed for anything that downgrades below 8.0

I guess this issue not only affects this specific rule, but all downgrade rules