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PHP Object-Oriented Programming Basics | PHP OOP Guide - Zend
: 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
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Jeffrey Way emphasizes that a class is the blueprint—the blueprint for a User , a Product , or a BillingCycle . An object, conversely, is the actual instance created from that blueprint—a specific user named "Jane," or a product named "Laptop." 2. Encapsulation and Data Protection
interface PaymentGateway public function processPayment(float $amount): bool; class StripeGateway implements PaymentGateway public function processPayment(float $amount): bool // Complex Stripe API logic goes here return true; Use code with caution. 3. Inheritance
Most PHP developers begin their journey writing procedural code. This typically looks like a series of scripts: header.php , footer.php , and logic files that mix database queries directly with HTML. While this works for simple tasks, it becomes a maintenance nightmare as applications grow.
class Employee extends User public string $role; public function __construct(string $name, string $email, string $role) parent::__construct($name, $email); $this->role = $role; Use code with caution. Polymorphism
: How to design code that is "swappable," allowing you to change implementations without breaking your application.
Dependency Injection is perhaps the most critical concept for building modern, testable PHP applications (and is the backbone of Laravel).
