What are some common pitfalls when trying to implement object-oriented programming concepts in PHP?

One common pitfall when implementing object-oriented programming concepts in PHP is not properly understanding the principles of encapsulation, inheritance, and polymorphism. To avoid this, make sure to clearly define classes with proper visibility modifiers, use inheritance effectively to avoid code duplication, and utilize interfaces and abstract classes for polymorphism. 

// Example of proper encapsulation using visibility modifiers
class Car {
    private $brand;
    protected $model;
    public $color;
    
    public function __construct($brand, $model, $color) {
        $this->brand = $brand;
        $this->model = $model;
        $this->color = $color;
    }
    
    public function getBrand() {
        return $this->brand;
    }
    
    protected function getModel() {
        return $this->model;
    }
}

// Example of inheritance to avoid code duplication
class ElectricCar extends Car {
    private $batteryCapacity;
    
    public function __construct($brand, $model, $color, $batteryCapacity) {
        parent::__construct($brand, $model, $color);
        $this->batteryCapacity = $batteryCapacity;
    }
    
    public function getBatteryCapacity() {
        return $this->batteryCapacity;
    }
}

Keywords

inheritance encapsulation polymorphism class method overriding

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