几个PHP面向对象小实例

1. 创建一个名为Person的类，该类具有name和age属性，并具有一个greet方法，用于打印出问候语。

class Person {
    private $name;
    private $age;

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

    public function greet() {
        echo "Hello, my name is " . $this->name . " and I am " . $this->age . " years old.";
    }
}

$person = new Person("John", 25);
$person->greet();

2. 创建一个名为Rectangle的类，该类具有width和height属性，并具有一个计算面积的方法。

class Rectangle {
    private $width;
    private $height;

    public function __construct($width, $height) {
        $this->width = $width;
        $this->height = $height;
    }

    public function calculateArea() {
        return $this->width * $this->height;
    }
}

$rectangle = new Rectangle(10, 5);
echo "The area of the rectangle is: " . $rectangle->calculateArea();

3. 创建一个名为Car的类，该类具有brand和color属性，并具有一个加速的方法。

class Car {
    private $brand;
    private $color;
    private $speed = 0;

    public function __construct($brand, $color) {
        $this->brand = $brand;
        $this->color = $color;
    }

    public function accelerate($speed) {
        $this->speed += $speed;
        echo "The " . $this->color . " " . $this->brand . " is now traveling at " . $this->speed . " km/h.";
    }
}

$car = new Car("Toyota", "red");
$car->accelerate(50);