How to handle the design pattern

How to handle the design pattern of nested arrays of DTO's in Yii2barebones PHP? - Stack Overflow
I'm trying to use DTOs for my first time.I am using Yii2 and PHP 7.1 .For simplicity my use case
How to handle the design pattern of nested arrays of DTO39s in Yii2barebones PHPStack Overflow
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