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
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