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Essential Progamming :

Progamming Paradigma PHP-OOP

This page containt guide or general information based on best practices for code in PHP for developer , this note dedicated for other developer so able to learn PHP with right way. in this section is shared about fundamental progamming with php .

This page was guided by these :

• https://www.php-fig.org/
• https://phptherightway.com/

Basic OOP Principles

1.Class, Object, Method, Attirbutes .

Here the simplest explanation about these concept :

Code Example :

<?php  
class Product {  
public $judul = "judul",  
            $penulis = "penulis",  
            $harga = 0;  

    public function __construct($judul,$penulis,$harga){  
        $this->judul = $judul;  
        $this->penulis = $penulis;  
        $this->harga = $harga;  
    }  

    public function getLabel(){  
        return "$this->judul, $this->penulis";  
    }  
}  
class PrintInfoProduct {  
    public function doPrint( Product $product ){  
        $string = "Nama komik , Nama , Harga";  
        return $string;  
    }  
}  
$product1 = new Product('Naruto','Masusi Natsumoto',80000);  
$infoProduct = new PrintInfoProduct();  
echo $infoProduct->doPrint($product1);

Note: public function doPrint( Product $product ) is class object type , its possible to set parameter as object . read more about it will lead in dependency injection, polymofsm.

2. Construct Function

This function will automatically called when first create or inisiate a class. you can set this by adding __ (2 underscores) :

<?php

class Product {
    public $judul = "judul",
                $penulis = "penulis",
                $harga = 0;

    public function __construct($judul,$penulis,$harga){
        $this->judul = $judul;
        $this->penulis = $penulis;
        $this->harga = $harga;
    }

    public function getLabel(){
        return "$this->judul, $this->penulis";
    }
}

$product1 = new Product('Naruto','Masusi Natsumoto',80000);

echo $product1->getLabel();

3. Visibility

4. Inheritance

Inheritance is relational between two or more classes where derived class inherits of properties of pre existing (base) classes

Base Classes : it is a class who inherited by another class , also called parent class or super class

Derived Class : it is class who inherit properties by parent (base) class , also called child class.

4. Overriding

class Animal {
  public function makeSound() {
    echo "The animal makes a sound.";
  }
}

class Dog extends Animal {
  public function makeSound() {
    echo "The dog barks.";
  }
}

// Create an object of the Dog class
$dog = new Dog();

// Call the makeSound() method on the Dog object
$dog->makeSound(); // Output: The dog barks.

There also more principlies in to discover more , well available on full source code above