Yii2 cannot find class using require(__DIR__ . '/../IState.php')?

1. Yii2 uses the require() function to import files, but it says that the class cannot be found. Can't it be used this way?

2. If I want to implement the call as shown below, how should I write it?

3. Is there a way to call a folder in Yii2? Yii1 has it. After calling this folder, all the classes and methods contained in this folder can be used.

Supplement: The method in the picture is OK when I use it on ecshop, but the class cannot be found on Yii2.

Reply content:

1. Yii2 uses the require() function to import files, but it says that the class cannot be found. Can't it be used this way?

2. If I want to implement the call as shown below, how should I write it?

3. Is there a way to call a folder in Yii2? Yii1 has it. After calling this folder, all the classes and methods contained in this folder can be used.

Supplement: The method in the picture is OK when I use it on ecshop, but the class cannot be found on Yii2.

Obviously there is a problem with your classpath, use namespaces to deal with it.