PHP OOP Constructor: Initialize Objects with Examples

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PHP OOP - Constructor

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What is a Constructor in PHP?

A constructor allows you to initialize an object's properties upon creation of the object.

A constructor is a special method in a class that is automatically called when a new object of the class is created.

In PHP, constructors are defined using the __construct() method.

Syntax of a Constructor

class ClassName {
  public function __construct() {
    // Code that runs when an object is created
  }
}

We see in the example below, that using a constructor saves us from calling the set_name() method which reduces the amount of code:

<?php

class Car {

public $brand;

public $color;

// Constructor

function __construct($brand) {

$this->brand = $brand;

}

// Methods

public function get_brand() {

return $this->brand;

}

// Creating objects with constructor

$car = new Car("Honda");

echo $car->get_brand(); // Output: This is a Honda.

Try it yourself

Another example:

<?php

class Car {

public $brand;

public $color;

// Constructor

public function __construct($brand, $color) {

$this->brand = $brand;

$this->color = $color;

}

// Methods

public function get_brand() {

return $this->brand;

}

public function get_color() {

return $this->color;

}

// Creating objects with constructor

$car = new Car("Honda","Blue");

echo "Brand:" . $car->get_brand();

echo "<br>";

echo "Color:" . $car->get_color();

Try it yourself

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