YII2 动态的new变量类名

就是不使用 use 加载

eg:

$test = 'News';
$aa = 'Wechat'.$test.'Reply';

$modelName = "\\backend\\models\\wechat\\{$aa}";
$newsReply = $modelName::findOne(['rid'=>113]);

转：https://www.cnblogs.com/jimz/p/9530770.html