没怎么用过这个新特性，其实也不算新啦，试试吧，现在静态类的继承很方便了

<?php class A { protected static $def = '123456'; public static function test() { echo get_class(new static); } public static function test2() { echo static::$def; } } class B extends A { protected static $def = '456789'; } class C extends A { protected static $def = 'abcdef'; } echo B::test(); echo '<br>'; echo C::test(); echo '<br>'; echo B::test2(); echo '<br>'; echo C::test2(); echo '<br>'; echo A::test(); echo '<br>'; echo A::test2(); echo '<br>';

// 输出结果 B C 456789 abcdef A 123456