php函数对象编程指南的最佳实践是什么？

class Person {
    private $name;
    private $age;

    public function getName() {
        return $this->name;
    }

    public function getAge() {
        return $this->age;
    }

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

    public function setAge($age) {
        $this->age = $age;
    }
}

class Person {
    private $name;
    private $age;

    // Getter methods
    public function getName() {
        return $this->name;
    }

    public function getAge() {
        return $this->age;
    }

    // Setter methods
    public function setName($name) {
        $this->name = $name;
    }

    public function setAge($age) {
        if ($age < 0) {
            throw new InvalidArgumentException("Age cannot be negative");
        }
        $this->age = $age;
    }
}

class Person {
    private $name;
    private $age;

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

$person = new Person("John", 30);
echo $person->getName() . " is " . $person->getAge() . " years old.";

$person->setName("John")
       ->setAge(30)
       ->getName(); // Returns "John"

interface SortingStrategy {
    public function sort($data);
}

class BubbleSortStrategy implements SortingStrategy {
    public function sort($data) {
        // Bubble sort implementation
    }
}

class QuickSortStrategy implements SortingStrategy {
    public function sort($data) {
        // Quick sort implementation
    }
}

class Sorter {
    private $sortingStrategy;

    public function setSortingStrategy(SortingStrategy $sortingStrategy) {
        $this->sortingStrategy = $sortingStrategy;
    }

    public function sort($data) {
        $this->sortingStrategy->sort($data);
    }
}

$sorter = new Sorter();
$sorter->setSortingStrategy(new BubbleSortStrategy());
$sorter->sort($data);