Is it considered a best practice to use class constants for defining types in PHP?

Using class constants for defining types in PHP is considered a best practice as it provides a clear and structured way to define and manage different types within a class. This approach helps improve code readability, maintainability, and reduces the risk of errors when working with different types of data. 

class UserType {
    const ADMIN = 'admin';
    const USER = 'user';
}

$userType = UserType::ADMIN;
echo $userType; // Output: admin

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class constants types PHP best practice defining

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