PHP OOP Constructor

PHP OOP Constructor Explained

PHP OOP Constructor is a special method inside a class that runs automatically when an object is created.

1. Syntax of Constructor in PHP

2. Why Use a Constructor?

Initialize object values
Set default data
Open database connections
Run code only once when object is created

3. Basic Constructor Example

Output:

A new car is created!

4. Constructor With Parameters

Most useful form.
We pass values when creating the object.

class Car {
public $brand;
public $color;

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

public function info() {
echo "Brand: $this->brand, Color: $this->color";
}
}

$car = new Car("Toyota", "Red");
$car->info();

class Car {

public $brand;

public $color;

public function __construct($brand, $color) {

$this->brand = $brand;

$this->color = $color;

}

public function info() {

echo "Brand: $this->brand, Color: $this->color";

}

$car = new Car("Toyota", "Red");

$car->info();

Output:

Brand: Toyota, Color: Red

5. Using Constructor to Set Default Values

6. Constructor Overloading (PHP Trick)

PHP does not support multiple constructors directly,
but we can simulate it:

7. Real-Life Practical Constructor Example

Auto connecting to database when object is created:

Summary

Feature	Meaning
`__construct()`	Auto run method
Parameters	Set values when object creates
`$this`	Refers to current object
Default values	Create simple overloaded constructors
Best use	Initialize object data

PHP OOP Constructor