class my{public static function say(){echo 'hello';}$o='my';$o::say();//这样可以调用 就是可变类名吧？‘my’::say();//这样为什么就报错了呢？ 上面变量里面也不是保存‘my’这个字符串吗？ 为什么上面的行下面的不行了呢？ 同样的值哦}
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