How can the code provided be improved in terms of object-oriented programming principles and best practices?

The code can be improved by encapsulating the properties and methods within a class to adhere to object-oriented programming principles. This will help in organizing the code, improving reusability, and maintaining a clear structure. 

class User {
    private $username;
    private $email;

    public function __construct($username, $email) {
        $this->username = $username;
        $this->email = $email;
    }

    public function getUsername() {
        return $this->username;
    }

    public function getEmail() {
        return $this->email;
    }

    public function setUsername($username) {
        $this->username = $username;
    }

    public function setEmail($email) {
        $this->email = $email;
    }
}

$user = new User('john_doe', 'john.doe@example.com');
echo $user->getUsername(); // Output: john_doe
echo $user->getEmail(); // Output: john.doe@example.com

$user->setUsername('jane_smith');
$user->setEmail('jane.smith@example.com');
echo $user->getUsername(); // Output: jane_smith
echo $user->getEmail(); // Output: jane.smith@example.com

Keywords

object-oriented programming PHP best practices code improvement principles

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