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
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<?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>';
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// 输出结果
B
C
456789
abcdef
A
123456
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