PHP OOP Classes & Objects

Classes, properties, methods and constructors.

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Object-oriented PHP organises code into classes.

class Car { ... } defines a class; new Car() creates an object.
__construct() runs when an object is created. Constructor promotion (PHP 8) declares properties in the parameters.
$this refers to the current object; use -> to access members.
Visibility: public, protected, private.
static members belong to the class: Car::$count, self::.

Key Takeaways: PHP OOP Classes & Objects

Mastering PHP OOP Classes & Objects helps you write clean and reliable PHP code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.

PHP OOP Classes & Objects Code Example

PHP

<?php
class BankAccount {
    private static int $count = 0;

    public function __construct(
        public string $owner,
        private float $balance = 0
    ) {
        self::$count++;
    }

    public function deposit(float $amount): static {
        $this->balance += $amount;
        return $this;
    }

    public function balance(): float { return $this->balance; }
    public static function count(): int { return self::$count; }
}

$acc = new BankAccount("Ayesha");
$acc->deposit(5000)->deposit(2500);
echo "{$acc->owner}: Rs {$acc->balance()}<br>";
echo "Accounts: " . BankAccount::count();

Output