How can understanding the difference between inheritance and Dependency Injection improve PHP code structure and design?

Understanding the difference between inheritance and Dependency Injection can improve PHP code structure and design by promoting a more flexible and maintainable codebase. Inheritance can lead to tight coupling between classes, making it harder to modify and test individual components. On the other hand, Dependency Injection allows for better separation of concerns and promotes reusability by injecting dependencies into a class rather than inheriting behavior. 

// Inheritance example
class DatabaseConnection {
    protected $connection;

    public function __construct() {
        $this->connection = new PDO('mysql:host=localhost;dbname=test', 'username', 'password');
    }
}

// Dependency Injection example
class DatabaseConnection {
    protected $connection;

    public function __construct(PDO $connection) {
        $this->connection = $connection;
    }
}

// Implementation using Dependency Injection
$pdo = new PDO('mysql:host=localhost;dbname=test', 'username', 'password');
$database = new DatabaseConnection($pdo);

Keywords

inheritance Dependency Injection PHP code structure design object-oriented programming

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