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php - problem with camelcase field model in yii2

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I built a project with Yii2 a year ago, I created more than ten models of the project, and the code has really expanded. My project worked well. And I had no problem.

This year, I had to transfer the database to another server.(connect remote to database) The new server has the following specifications:

new server:

server: 20.04.4

mysql: 8.0.21

php: 7.4.7

Previous server: server: 19.0.4

mysql: 5.7.28

php: 7.2.24

The problem is that the fields defined as CamelCase in the database are not identifiable in this project.

How can I use CamelCase fields in a project without renaming the fields in the database?

if I removed 'attributes' => [PDO::ATTR_CASE => PDO::CASE_LOWER], from db.php I get this error:

Undefined asked

2021-12-5

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2021-12-5

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PHP

PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites. The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/

Yii

Yii is a simple yet high performance generic component framework based framework. It is known for its high performance, but above all, it is famous for its simplicity. This framework appeared in December 2008. It allows you to use third-party code, and its Gii code generator allows you to quickly create basic structures from which you can build your own solutions.
https://www.yiiframework.com/

MySQL

DBMS is a database management system. It is designed to change, search, add and delete information in the database. There are many DBMSs designed for similar purposes with different features. One of the most popular is MySQL. It is a software tool designed to work with relational SQL databases. It is easy to learn even for site owners who are not professional programmers or administrators. MySQL DBMS also allows you to export and import data, which is convenient when moving large amounts of information.
https://www.mysql.com/