PHP OOP Constructor

by CodeCapsule

🔷 PHP OOP – Constructor Explained

A 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:

class Student {
public $name;
public $age;

public function __construct($name = "Unknown", $age = 0) {
$this->name = $name;
$this->age = $age;
}
}

$s1 = new Student();
$s2 = new Student("Rahul");
$s3 = new Student("Amit", 21);

class Student {

public $name;

public $age;

public function __construct($name = "Unknown", $age = 0) {

$this->name = $name;

$this->age = $age;

}

$s1 = new Student();

$s2 = new Student("Rahul");

$s3 = new Student("Amit", 21);

🔶 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

🔷 PHP OOP – Constructor Explained

✅ 1. Syntax of Constructor in PHP

✅ 2. Why Use a Constructor?

🔶 3. Basic Constructor Example

Output:

🔶 4. Constructor With Parameters

🔶 5. Using Constructor to Set Default Values

🔶 6. Constructor Overloading (PHP Trick)

🔶 7. Real-Life Practical Constructor Example

Auto connecting to database when object is created:

🎯 Summary

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PHP OOP Constructor

🔷 PHP OOP – Constructor Explained

✅ 1. Syntax of Constructor in PHP

✅ 2. Why Use a Constructor?

🔶 3. Basic Constructor Example

Output:

🔶 4. Constructor With Parameters

🔶 5. Using Constructor to Set Default Values

🔶 6. Constructor Overloading (PHP Trick)

🔶 7. Real-Life Practical Constructor Example

Auto connecting to database when object is created:

🎯 Summary

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PHP OOP Interfaces

PHP OOP Destructor

Leave a Reply Cancel reply