PHP静态延迟绑定简单示例
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
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 '
';
echo C::test();
echo '
';
echo B::test2();
echo '
';
echo C::test2();
echo '
';
echo A::test();
echo '
';
echo A::test2();
echo '
';
// 输出结果
B
C
456789
abcdef
A
123456
