PHP Object-Oriented Programming

Pengantar

Pengajar: Eko Kurniawan Khannedy
Pengalaman kerja: 10+ tahun
Lokasi kerja: Technical Architect di e-commerce Indonesia
Konten: Programming di YouTube channel Programmer Zaman Now
Kontak: Telegram @Kennedy
Media Sosial: Facebook, Instagram, YouTube, Telegram

Ikhtisar Materi

Topik: PHP Object-Oriented Programming (OOP)
Pra-syarat: Pahami PHP dasar
Referensi: Video PHP dasar di channel Programmer Zaman Now

Key Concepts OOP

Obyek: Data komposit dengan properties dan methods
Class: Blueprint/Prototype untuk membuat object

Obyek dan Class

Obyek: Data yang memiliki field/properties dan methods (function/behevior)
Class: Cetakan untuk membuat obyek
Properties mirip variabel yang melekat pada obyek
Methods didefinisikan dalam class, bisa public/private

Contoh Class Person

class Person {
  public $name;
  public $address;
  public $country = 'Indonesia';
}

$person1 = new Person();
$person1->name = 'Eko';
$person1->address = 'Subang';

Penulisan Class

Menggunakan kata kunci class, format CamelCase
Nama file tidak harus sama dengan nama class (PHP fleksibel)

Static Properties dan Methods

Static: Menempel pada kelas, tidak perlu instansiasi objek
Mengakses dengan :: tanpa membuat objek terlebih dahulu

Contoh Static Method

class MathHelper {
  public static function sum($a, $b) {
    return $a + $b;
  }
}

$result = MathHelper::sum(1, 2); // Output: 3

Inheritance (Pewarisan)

Inheritance: Mewariskan properti dan method dari class parent ke child
Keywords: extends
Contoh:

class Manager {
  public $name;
  public function sayHello($name) {
    echo "Hello $name, my name is $this->name";
  }
}

class VicePresident extends Manager {
}

Polymorphism: Kemampuan objek berubah bentuk ke turunan/class lain
Contoh:

$manager = new Manager();
$vp = new VicePresident();
$manager = $vp; // Polymorphism

Interface

Defines a contract for methods in a class
Implements keyword used

Traits

Reusable set of methods that can be included in multiple classes
Used via use keyword

Abstract Class

Class that cannot be instantiated; used as a base class
Contain abstract methods that must be defined in child classes

Exception Handling

try-catch: To handle exceptions without stopping script execution
finally: Execute code regardless of exception being thrown or not
Creating custom exceptions: Extend the Exception class

Example Custom Exception

class ValidationException extends Exception {
}

try {
  throw new ValidationException("Error!");
} catch (ValidationException $e) {
  echo $e->getMessage();
} finally {
  echo "Done.";
}

Reflection

Reflection: Inspect and manipulate classes, properties, and methods at runtime
Used for debugging, code analysis, and framework development

Example Usage

$reflectionClass = new ReflectionClass('Person');
$properties = $reflectionClass->getProperties();

foreach ($properties as $property) {
  echo $property->getName();
}

Regular Expressions

Used for pattern matching in strings
Functions: preg_match, preg_replace, preg_split

Example Usage

if (preg_match('/Eko|awan|Ed/i', 'Eko Kurniawan Kennedy', $matches)) {
  print_r($matches);
}

Date-Time Handling

DateTime class: For handling dates and times in PHP
Functions like format, setDate, setTime, etc.

Example Usage

$date = new DateTime();
$date->setDate(1990, 1, 20);
$date->setTime(10, 10, 10);
echo $date->format('Y-m-d H:i:s'); // Output: 1990-01-20 10:10:10

Summary

OOP basics: Objects, Classes, Properties, Methods, Inheritance
Exception handling using try-catch-finally
Advanced topics including Traits, Abstract Classes, Interfaces
Reflection for runtime code manipulation
Regular Expressions for pattern matching
Date-Time handling for manipulating date and time in applications

Further Learning:

PHP Database: Integrasi aplikasi dengan database
PHP Web Development: Membuat aplikasi berbasis web dengan PHP
PHP Composer: Library management tool for PHP
PHP Unit Testing: Menulis unit test untuk aplikasi PHP agar lebih andal

Referensi Tambahan: