Extra Objects

Objects (under construction)

This section is to give you an overview of most basic aspects of objects.

Objects are a way of encapsulating or compartmentalizing variables and functions to keep them from conflicting with or overwriting other variables and functions that may be used in your script.

Object-oriented programming (OOP) is a programming paradigm based on the concept of "objects". In OOP programming, programs are designed by making them out of objects that interact with one another.

An object starts with a class. A class may contain it's own constants, variables (called "properties"), and functions (called "methods").

Simple Class definition:

class Player
{
    // property declaration
    public $hitPoints = 100;

    // method declaration
    public function getHitPoints() {
        return $this->hitPoints;
    }
    
    public function takeDamage( $damage ){
        $this->hitPoints -= $damage;
    }
}

new

To create an instance of a class, the new keyword must be used.

Example: Creating multiple instances of the Player class.

$playerOne = new Player();
$playerOne->takeDamage( 12 );

$playerTwo = new Player();
$playerTwo->takeDamage( 55 );


echo $playerOne->getHitPoints();
// 88

echo $playerTwo->getHitPoints();
// 45