PHP Objects And OOP

PHP Code Snippets OOP and Objects
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About

In this code snippet, we’ll take a look at objects and basic of object oriented programming in PHP.

I will just show how to make and use classes, interfaces, properties, … in PHP. I won’t go into OOP too much as I already did some other posts about that.

Let’s see the example code below.

Code:

<?php
//Code/////////////////////////////////////////////////////////////////////
//Interface implementation in PHP.
interface IDrivable{
public function drive($destination);
}
//Abstract class implementation in PHP.
abstract class Vehicle {
//Force child class to make it's own implementation of this function.
abstract protected function FillUpTank($fuel);
//Child class will inherit this function and properties.
//Properties.
public $Mileage;
public $Year;
public $Model;
public function GetCarStats(){
echo "Mileage: " . $this->Mileage . " Year: " . $this->Year . " Model: " . $this->Model;
}
}
//Class implementation in PHP.
class Car extends Vehicle implements IDrivable{
//Constructor
function __construct($mileage, $year, $model){
//When referencing class mambers inside their class $this-> must be put infront.
$this->Mileage = $mileage;
$this->Year = $year;
$this->Model = $model;
}
public $Fuel;
//Implement FillUpTank from Vehicle.
function FillUpTank($fuel){
$this->Fuel += $fuel;
}
//Implement drive() from IDrivable interface.
public function drive($destination){
echo "Driving to " . $destination;
}
//Static class members don't need the class to be instantiated to be used.
public static $VehicleType = "road vehicle";
public static function GetVehicleType(){
return Car::$VehicleType;
}
}
////////////////////////////////////////////////////////////////////////////
//Entry point/////////////////////////////////////////////////////////////
//More about OOP in PHP: https://www.php.net/manual/en/language.oop5.php
echo Car::GetVehicleType();//:: is used to access static class members.
echo "<br>";
//Make new instance of Car.
$car = new Car(100000, 2010, "Some model...");
echo $car->Model;
echo "<br>";
$car->drive("somewhere...");
echo "<br>";
$car->GetCarStats();
echo "<br>";
////////////////////////////////////////////////////////////////////////////

Resulting Output:

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