<?php
abstract class Some
{
    public static function test()
    {
        self::bla();    // Some::bla
        static::bla();  // Any::bla
    }

    protected static function bla()
    {
        echo "Вызываем Some\n";
    }
}

class Any extends Some
{
    protected static function bla()
    {
        echo "Вызываем Any\n";
    }
}


Any::test();