What are common pitfalls to avoid when using extends keyword in PHP classes for inheritance?

One common pitfall to avoid when using the `extends` keyword in PHP classes for inheritance is creating a deep inheritance hierarchy, which can lead to complex and hard-to-maintain code. To solve this, it's recommended to favor composition over inheritance when possible, and only use inheritance when there is a clear "is-a" relationship between the classes. 

// Example of using composition over inheritance
class Engine {
    public function start() {
        echo "Engine started";
    }
}

class Car {
    private $engine;

    public function __construct() {
        $this->engine = new Engine();
    }

    public function start() {
        $this->engine->start();
        echo "Car started";
    }
}

$car = new Car();
$car->start();

Keywords

extends keyword PHP classes inheritance object-oriented programming subclass

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