Are there any specific best practices to keep in mind when transitioning to PHP 5 object-oriented programming?

When transitioning to PHP 5 object-oriented programming, it is important to follow best practices to ensure clean and efficient code. Some key practices to keep in mind include proper encapsulation, inheritance, and polymorphism. Additionally, make use of interfaces and abstract classes to define common behavior and ensure code reusability.

// Example of implementing inheritance in PHP 5 object-oriented programming

class Animal {
    protected $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function speak() {
        echo "Animal sound";
    }
}

class Dog extends Animal {
    public function speak() {
        echo "Woof!";
    }
}

$dog = new Dog("Buddy");
$dog->speak(); // Output: Woof!