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The Idea: Initializing Objects with Constructors

When you create an object, you often want to set its initial state. Constructors are special methods that let you do this automatically when the object is created.

Code Example: Using a Constructor to Set Properties

Below, we define a Car class with a constructor that sets the color and brand when a new object is created.

CarExample.php


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<?php
class Car {
    public $color;
    public $brand;

    public function __construct($color, $brand) {
        $this->color = $color;
        $this->brand = $brand;
    }
}

// Creating a new Car object
$myCar = new Car("red", "Toyota");
echo "My car is a " . $myCar->color . " " . $myCar->brand . ".";

In this example, the focus is on using a constructor. The __construct() method is a special function that automatically runs when a new object is created. It takes parameters $color and $brand and assigns them to the object’s properties using $this->color and $this->brand.

When we create a new Car object with new Car("red", "Toyota"), the constructor sets the properties immediately. Then we can access these properties with $myCar->color and $myCar->brand and use them to display a message about the car.

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セクション 1. 章 4

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Constructors and Object Initialization

The Idea: Initializing Objects with Constructors

Code Example: Using a Constructor to Set Properties