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PHP Object-oriented programming (OOP) is based on the principles of encapsulation, inheritance and polymorphism to achieve separation of responsibilities and code reuse. OOP allows binding data and methods together to form objects (encapsulation), inheriting properties and methods from parent classes (inheritance), and overriding parent class methods in child classes (polymorphism). In a practical case, OOP principles were used to create a system for managing users and employees, achieving separation of duties, code reuse and better scalability.
PHP In-depth understanding of object-oriented programming: practical application of object-oriented principles
Object-oriented programming (OOP) is a A programming paradigm that emphasizes the principles of encapsulation, inheritance, and polymorphism. In PHP, OOP helps you write more flexible and maintainable code.
1. Encapsulation
Encapsulation binds data and methods together to form an object. This helps keep your data private and allows you to control access to your data.
class User { private $name; private $email; public function getName() { return $this->name; } public function setName($name) { $this->name = $name; } }
2. Inheritance
Inheritance allows one class (subclass) to inherit properties and methods from another class (parent class). This facilitates code reuse and extending parent class functionality.
class Employee extends User { private $salary; public function getSalary() { return $this->salary; } public function setSalary($salary) { $this->salary = $salary; } }
3. Polymorphism
Polymorphism allows parent class methods to have different implementations in child classes. This helps write more flexible code and simplifies interactions between objects.
class Admin extends Employee { public function getAccess() { return 'Admin'; } } $admin = new Admin(); echo $admin->getAccess(); // Output: Admin
Practical case
Consider a system for managing users and employees. Using OOP we can create User
and Employee
classes where Employee
class inherits from User
class.
// models/User.php class User { private $id; private $name; private $email; // Getters and setters } // models/Employee.php class Employee extends User { private $salary; // Getters and setters } // controller/UserController.php class UserController { public function index() { $users = User::all(); return view('users.index', ['users' => $users]); } // Other methods }
This system leverages OOP principles to achieve separation of duties, code reuse and better scalability.
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