PHP 고급 기능: 객체 지향 프로그래밍의 모범 사례

interface PersonInterface {
    public function getName();
    public function getAge();
}

abstract class Person implements PersonInterface {
    protected $_name;
    protected $_age;

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

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

    public abstract function getAge();
}

class Student extends Person {
    public function getAge() {
        return $this->_age - 5;
    }
}

$student = new Student('John Doe', 25);
echo $student->getName(); // John Doe
echo $student->getAge(); // 20

interface LoggerInterface {
    public function log($message);
}

class FileLogger implements LoggerInterface {
    public function log($message) {
        // 将 $message 记录到文件中
    }
}

class ConsoleLogger implements LoggerInterface {
    public function log($message) {
        // 将 $message 记录到控制台
    }
}

class MyClass {
    private $_logger;

    public function __construct(LoggerInterface $logger) {
        $this->_logger = $logger;
    }

    public function doSomething() {
        $this->_logger->log('Something happened!');
    }
}

class Repository {
    protected $_data = [];

    public function add($item) {
        $this->_data[] = $item;
    }

    public function get($key) {
        return $this->_data[$key] ?? null;
    }

    public function all() {
        return $this->_data;
    }
}