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class Circle extends Shape public function area($radius) return pi() * $radius * $radius;: Using visibility (public, private, protected) to signal which parts of an object are internal and should be hidden from the outside world. Advanced Design Concepts Object Composition object-oriented principles in php laracasts download
// Good (Encapsulation + Type safety) function processOrder(Order $order): ShippingConfirmation This guide outlines the core concepts covered in
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