php后期静态绑定

whoami

<?php
class A {
    public static $name = null;
    public static function whoami() {
        if (!static::$name) {
            static::$name = get_called_class();
        }
        return static::$name;
    }
}

class B extends A {
    public static $name = null;
}
class C extends A {
}


echo A::whoami();
echo "\n";
echo B::whoami();
echo "\n";
echo C::whoami();
echo "\n";