抽象静态属性不能被覆盖？

abstract class Ghost {

    protected static $var = 'I\'m a ghost';

    final public static function __callStatic($method, $args = array()) {
        echo self::$var;
    }

}


class Person extends Ghost { 
    protected static $var = 'I\'m a person';
}

The call of Person::whatever() will print: I'm a ghost. Why?

You're looking for something called Late Static Binding, which requires PHP 5.3+

"self" is used by Current class, if you want get child static property, use "static" as :

final public static function __callStatic($method, $args = array()) {
   echo **static**::$var;
}