How can the EVA principle be applied to improve the maintainability of PHP scripts within a website?

Issue: The maintainability of PHP scripts within a website can be improved by following the EVA principle, which stands for Encapsulation, Variation, and Abstraction. By encapsulating related code into functions or classes, varying functionality through parameters or inheritance, and abstracting common logic into reusable components, the codebase becomes easier to maintain and extend. 

// Encapsulation: Define functions to encapsulate related code
function calculateTotal($price, $quantity) {
    return $price * $quantity;
}

// Variation: Use parameters to vary functionality
function calculateDiscountedTotal($price, $quantity, $discount) {
    $total = calculateTotal($price, $quantity);
    return $total - ($total * $discount);
}

// Abstraction: Abstract common logic into reusable components
class Database {
    private $connection;

    public function __construct($host, $username, $password, $database) {
        $this->connection = new mysqli($host, $username, $password, $database);
    }

    public function query($sql) {
        return $this->connection->query($sql);
    }
}

Keywords

EVA principle maintainability PHP scripts website improvement

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