面向对象编程

PHP 支持面向对象编程。

类和对象

class Animal {
    public $name;
    public $sound;

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

    public function makeSound() {
        return $this->sound;
    }
}

$cat = new Animal("Cat", "Meow");
echo $cat->makeSound();

继承

class Dog extends Animal {
    public function __construct($name) {
        parent::__construct($name, "Woof");
    }
}

接口

interface Flyable {
    public function fly();
}

class Bird implements Flyable {
    public function fly() {
        return "飞得高！";
    }
}

结论

面向对象编程帮助组织代码。