PHP

php calling abstract static function from inside abstrac class

abstract class AbstractFoo{
    public static function foo() {
        throw new RuntimeException("Unimplemented");
    }
    public static function getFoo(){
        return static::foo();
    }
}

class ConcreteFoo extends AbstractFoo{
    public static function foo(){
        return "bar";
    }
}

echo ConcreteFoo::getFoo();

php abstract class static method

Answer
  https://stackoverflow.com/questions/41611058/why-does-php-allow-abstract-static-functions/41611876